TWI849054B - Calculation method, image generation method, ophthalmic lens design method, ophthalmic lens manufacturing method, ophthalmic lens, ophthalmic lens sales method, calculation device and program for calculation processing - Google Patents

Abstract

The calculation method of the present invention is a method for calculating values related to the optical properties of an eyeglass lens. The eyeglass lens has a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and a middle portion disposed between the near portion and the distance portion, and the calculation method includes the following steps: obtaining prescription data of a wearer; obtaining a first distance, which is the distance viewed through the near portion, and a second distance, which is the distance viewed through the middle portion; and calculating the addition or addition rate of the middle portion suitable for the wearer to view the second distance based on the prescription data, the first distance, and the second distance.

Description

Calculation method, image generation method, ophthalmic lens design method, ophthalmic lens manufacturing method, ophthalmic lens, ophthalmic lens sales method, calculation device and program for calculation processing

The present invention relates to a calculation method, an image generation method, a design method for an eyeglass lens, a manufacturing method for an eyeglass lens, an eyeglass lens, a sales method for an eyeglass lens, a calculation device and a program.

A spectacle lens having a distance portion, an intermediate portion, and a near portion is designed based on the eye point. A method for designing such a spectacle lens based on the distance at which the wearer wishes to see near the eye point is proposed (see patent document 1).

[Prior Art Literature] [Patent Literature]

Patent document 1: Japanese Patent No. 6169343

According to the first aspect of the present invention, the calculation method is a method for calculating values related to the optical characteristics of an eyeglass lens, the eyeglass lens having a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and an intermediate portion disposed between the near portion and the distance portion, and the calculation method comprises the following steps: obtaining prescription data of a wearer; obtaining a first distance, which is the distance viewed through the near portion, and a second distance, which is the distance viewed through the intermediate portion; and calculating the addition or addition rate of the intermediate portion suitable for the wearer to view the second distance based on the prescription data, the first distance, and the second distance.

According to the second aspect of the present invention, the image generation method includes the following steps: obtaining numerical values related to the optical properties of an eyeglass lens, the eyeglass lens having a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and an intermediate portion disposed between the near portion and the distance portion; and generating an image including information about the optical properties based on the numerical values; the numerical values include the addition or addition rate of the intermediate portion suitable for the wearer to view the second distance calculated based on the wearer's prescription data, the distance viewed through the near portion, i.e., the first distance, and the distance viewed through the intermediate portion, i.e., the second distance.

According to the third aspect of the present invention, the computing device is a device for computing values related to the optical characteristics of a spectacle lens, the spectacle lens having a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and an intermediate portion disposed between the near portion and the distance portion, and the computing device has: a prescription data acquisition unit for acquiring a prescription of a wearer; data; a distance acquisition unit, which acquires the distance viewed by the wearer through the near portion, i.e., the first distance, and the distance viewed through the middle portion, i.e., the second distance; and an addition calculation unit, which calculates the addition or addition rate of the middle portion suitable for the wearer to view the second distance based on the formula data, the first distance, and the second distance.

According to the fourth aspect of the present invention, the program is used to cause a processing device to perform calculation processing of values related to the optical characteristics of a spectacle lens, wherein the spectacle lens has a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and an intermediate portion disposed between the near portion and the distance portion, and the calculation processing includes: formula data acquisition processing, which acquires a wearing formula data of the wearer; distance acquisition processing, which acquires the distance viewed by the wearer through the near portion, i.e., the first distance, and the distance viewed through the middle portion, i.e., the second distance; and addition calculation processing, which calculates the addition or addition rate of the middle portion suitable for the wearer to view the second distance based on the formula data, the first distance, and the second distance.

31R,31L: Elements of the first screen

32R,32L: Elements of the second screen

33R,33L: Elements of the third screen

34: Elements of the fourth screen

35: Elements of the fifth screen

36: Elements of the sixth screen

41: Basic information display section

42: Join the information display department

43: Join the rate information display department

50,50a: Remote control information display unit

51,61,71: Lens image

52,72: Dashed circle

53,63,73: dotted line

54,55,56,64,74: Rectangle of dotted lines

60: Middle information display section

62:Mark

65,75: Double-direction arrow

66,76: Upward arrow

67,77: Downward arrow

70: Nearby information display unit

200: Computing device

201: Storage Department

202: Communications Department

203: Display unit

204: Input Department

210: Control Department

211: Recipe data acquisition department

212: Distance Acquisition Department

213: Image Generation Department

214: Display control unit

241: Touch panel

242: Computing device body

300: Computing Department

310: Adjustment force calculation department

320: Join the degree calculation department

330: Distance calculation unit

340: Range Calculation Department

400: Astigmatism distribution

500: 3rd distance input unit

501: Slider

502: Numerical selection tag

950:PC

951: Communication line

952: Computer

953:CD-ROM

Add: Addition degree of nearby reference points

AddEP: Addition degree at the eye point

Addp: Formula addition degree

CA,CA1,CA2,CA10,CA20: Add degree curve

D1: 1st distance

D2: 2nd distance

Df1: 1st far point distance

Df2: 2nd farthest point distance

Dn1: 1st near point distance

Dn2: Second periapsis distance

EP: Eye point

F: Remote Use Department

FV: Remote reference point

G1, G1a: Input screen

G2, G3, G4: Information provided by the video

LS: Eyeglass lenses

M: Main focus line

N: Nearby part

NV: Near reference point

Ob1, Ob2: object

P: Middle part

W1: 1st clear vision range

W2: Second visual range

Wn: The first object’s visual range

Wp: Second object’s visual range

Wr: wearer

[Figure 1] is a conceptual diagram showing the configuration of a computing device in one embodiment.

[Figure 2] is a conceptual diagram showing an eyeglass lens in an implementation form.

[Figure 3] is a picture showing the input screen.

[Figure 4] is a graph showing the addition degree curve.

[Figure 5] (A) is a conceptual diagram used to illustrate the far point and near point, and Figure 5 (B) is a conceptual diagram used to illustrate the side vision range of an object.

[Figure 6] is a conceptual diagram used to illustrate the distance required to calculate the side vision range of an object.

[Figure 7] is a diagram showing the information provision image.

[Figure 8] is a flow chart showing the flow of a calculation method in an implementation form.

[Figure 9] is a flow chart showing the flow of a calculation method in an implementation form.

[Figure 10] is a three-dimensional diagram of the computing device.

[Figure 11] is a graph showing the joining degree curve.

[Figure 12] is a diagram showing the information provision image.

[Figure 13] is a diagram showing the information provision image.

[Figure 14] is a flow chart showing the process of the calculation method of the variant.

[Figure 15] is a diagram showing the input screen.

[Figure 16] is a conceptual diagram used to illustrate the program.

The following describes a calculation method of an implementation form, etc., with appropriate reference to the drawings. In the following description, the unit of refractive power is expressed by diopter (D) unless otherwise specified. In addition, in the following description, when it is expressed as "above", "below", "upper part", "lower part", etc. of the eyeglass lens, it is assumed to be based on the positional relationship of the lens when the eyeglass lens is worn.

FIG1 is a conceptual diagram showing the structure of a computing device related to the computing method of this embodiment. The computing device 200 has a storage unit 201, a communication unit 202, a display unit 203, an input unit 204, and a control unit 210. The control unit 210 has a recipe data acquisition unit 211, a distance acquisition unit 212, a calculation unit 300, an image generation unit 213, and a display control unit 214. The calculation unit 300 has an adjustment force calculation unit 310, an addition degree calculation unit 320, a distance calculation unit 330, and a range calculation unit 340.

The computing device 200 is a computing device that calculates values related to the optical characteristics of the eyeglass lens based on information related to the eyeglass lens obtained through input or communication from the user of the computing device 200. Here, the user of the computing device 200 (hereinafter referred to as the user) refers to a person who operates the computing device 200, for example, a wearer of an eyeglass lens including a customer of an eyeglass store and a clerk of the eyeglass store.

In the following embodiments, the numerical values related to the optical properties of the ophthalmic lens include the properties represented by the formula data including the refractive power distribution, addition distribution and aberration distribution such as astigmatism, spherical power, cylindrical power and astigmatism axis angle of the ophthalmic lens, and the numerical values of the properties that can be calculated based on the distribution, formula or shape or physical properties of the ophthalmic lens. The numerical values include the following first far point distance, first near point distance, second far point distance, second near point distance, first clear vision range, second clear vision range, first object side clear vision range and second object side clear vision range.

The computing device 200 also functions as an image generating device or an information providing device, which provides information about numerical values related to optical characteristics obtained by calculation to a user by generating and outputting an image containing the information.

FIG. 2 is a conceptual diagram showing the parts of the eyeglass lens. The computing device 200 calculates information about the optical characteristics of the eyeglass lens LS. In the example of FIG. 2, the eyeglass lens LS is a progressive refractive lens for near and mid-range use. The eyeglass lens LS is in a state before the lens is processed to match the shape of the eyeglass frame (state before the lens is polished), and is formed into a circular shape when viewed from above. The upper side of the eyeglass lens LS in the figure is arranged at the top when worn, and the lower side in the figure is arranged at the bottom when worn. The eyeglass lens LS has a far-view portion F, a near-view portion N, and a middle portion P.

The distance part F is arranged on the upper part of the eyeglass lens LS, and the near part N is arranged on the lower part of the eyeglass lens LS. After the eyeglass lens LS is processed for eyeglass use, the distance part F becomes a part having a refractive power corresponding to a longer distance than the near part N. In other words, the distance part F is a part used to view an object at a longer distance than the object viewed through the near part N. The middle part P is arranged in the middle of the distance part F and the near part N in the eyeglass lens LS, and the refractive power between the distance part F and the near part N changes smoothly and appropriately and is connected.

The eyeglass lens LS has a plurality of reference points. As such reference points, for example, as shown in FIG. 2 , the eye point (also called the fitting point) EP, the distance reference point FV, and the near reference point NV can be listed. The eye point EP becomes the reference point for the position of the pupil when the wearer wears the eyeglass lens LS. In the following embodiment, it is assumed that the eye point EP is located in the middle part P. The distance reference point FV becomes the reference point for measuring the distance power of the lens. The near reference point NV becomes the reference point for measuring the near power of the lens. Furthermore, the distance part F is a region including the distance reference point FV, and may have a region with a substantially constant refractive power, or may not have a region with a substantially constant refractive power. In addition, the near portion N is an area including the near reference point NV, and may have an area with a substantially constant refractive power or may not have an area with a substantially constant refractive power.

At the approximate center of the eyeglass lens LS, there is an imaginary line on the lens through which the wearer's line of sight passes when the wearer looks at an object located below the front from the upper front. The principal line of sight M is also called the principal meridian. The principal line of sight M passes through the distance reference point FV and the eye point EP in the distance portion F, and is set along the direction corresponding to the vertical direction when wearing the eyeglasses (hereinafter referred to as the "height direction"). The principal line of sight M passes through the near reference point NV in the near portion N, and is set along the height direction. The near reference point NV approaches inward toward the side of the nose (the right side in FIG. 2 ) in consideration of convergence. A portion of the main sight line M connects the far reference point FV and the near reference point NV in the middle portion P, and is therefore set obliquely relative to the height direction.

The distance between the distance reference point FV and the eye point EP along the height direction is set to Lf, and the distance between the eye point EP and the near reference point NV along the height direction is set to Ln. In the following embodiment, a progressive refractive power lens in which the distance (Lf+Ln) between the distance reference point FV and the near reference point NV along the height direction is 18 mm or more or the addition at the eye point EP is 15% or more of the difference between the addition at the near reference point NV and the addition at the distance reference point FV (hereinafter referred to as "nominal addition") is set as a progressive refractive power lens for intermediate and near use (hereinafter referred to as intermediate and near use lens). In the addition curve (see Figure 4), eyeglass lenses with a steeper inclination on the lower side than on the upper side of the eye point EP in the middle part P are not universal. From this point of view, the addition at the eye point EP of the near and intermediate dual-purpose lens is appropriately set to less than 50% of the nominal addition, less than 40%, etc. In addition, the progressive refractive power lens with the above distance (Lf+Ln) less than 18mm and the addition at the eye point EP less than 15% of the nominal addition is set as a near and far dual-purpose progressive refractive power lens (hereinafter referred to as a near and far dual-purpose lens).

In a near and intermediate dual-purpose lens, for example, it is designed so that objects at a distance or an intermediate distance can be viewed preferably through the distance portion F, and objects at a near distance can be viewed preferably through the near portion N. In a near and intermediate dual-purpose lens, for example, it is designed so that objects at a distance can be viewed preferably through the distance portion F, and objects at a near distance can be viewed preferably through the near portion N. The distances corresponding to the far distance, the middle distance, and the near distance also vary according to the country, region, or the purpose of the eyeglass lenses, and there is no special limitation. For example, the far distance is more than 1m, the middle distance is more than 50cm and less than 1m, and the near distance is more than 25cm and less than 50cm.

Returning to FIG. 1 , the storage unit 201 has a non-volatile storage medium. The storage unit 201 stores the data required for the calculation unit 300 to perform calculations and the programs used by the control unit 210 to perform processing, etc.

The communication unit 202 is composed of a communication device capable of communicating with a network such as the Internet via wireless or wired connection, receiving data required for processing by the control unit 210 or sending information obtained through calculation processing by the calculation unit 300 or image data generated by the image generation unit 213.

The display unit 203 has a display device such as a liquid crystal monitor, and displays images corresponding to the image data generated by the image generation unit 213 under the control of the display control unit 214.

The input unit 204 is composed of input devices such as a mouse, a keyboard, various buttons or a touch panel. The input unit 204 receives the information required for processing by the control unit 210 through the user's input to the input device.

The control unit 210 is composed of a processor such as a CPU, and executes the program stored in the storage unit 201 to perform various processes, becoming the main body of each action of the computing device 200.

Furthermore, part of the data used by the control unit 210 may also be stored in a remote server, etc.

The formula data acquisition unit 211 of the control unit 210 acquires the formula data of the wearer. The display device of the display unit 203 displays an input screen for inputting formula data. The user views the input screen and inputs the formula data obtained from the wearer through the input unit 204.

Furthermore, the recipe data acquisition unit 211 can also acquire recipe data via communication, etc.

FIG3 is a diagram showing an example of an input screen. The image data corresponding to the input screen G1 is generated by the image generation unit 213, and based on the image data, the input screen G1 is displayed on the display unit 203 under the control of the display control unit 214. The input screen G1 has first screen components 31R and 31L, second screen components 32R and 32L, third screen components 33R and 33L, fourth screen components 34, fifth screen components 35, and sixth screen components 36.

The first screen components 31R and 31L are text blocks for inputting the spherical power (hereinafter referred to as spherical power) of the lens required to completely correct the wearer's vision for the right eye and the left eye respectively. Here, complete correction refers to the state in which the wearer can see clearly at infinity even without adjusting the eyes. The second screen components 32R and 32L are text blocks for inputting the cylindrical power (hereinafter referred to as cylindrical power) of the lens required to completely correct the wearer's vision for the right eye and the left eye respectively. The third screen components 33R and 33L are text blocks for inputting the angle of the astigmatism axis corresponding to the above cylindrical power (hereinafter referred to as astigmatism axis angle) for the right eye and the left eye respectively.

Furthermore, the form of the screen components used to input values is not particularly limited as long as it can process the input data, for example, it is set to display a number of options on the screen and select one of them. The same applies to the following screen components.

Component 34 of the fourth screen is a text box for inputting the addition included in the prescription data. Hereinafter, the addition is referred to as the prescription addition. Hereinafter, the prescription addition is set as the addition included in the prescription data of the wearer and set for the near reference point NV based on the far reference point FV.

The fifth screen component 35 is a text box for inputting the distance that the wearer views through the middle part P. The distance is set to indicate the distance at which the wearer is expected to view the object through the middle part P or the distance that the wearer wants to view. The sixth screen component 36 is a text box for inputting the distance that the wearer views through the near part N. The distance is set to indicate the distance at which the wearer is expected to view the object through the near part N or the distance that the wearer wants to view.

For example, in an eyeglass store, a clerk may ask the wearer what kind of intermediate distance and near distance he usually uses to view an object, and input the distances answered by the wearer as the distances viewed through the intermediate portion P and the near portion N, respectively. Alternatively, a clerk may ask the wearer what kind of object he usually uses to view an object, and input the distance between the object answered by the wearer and the normal distance between the eye and the object when viewing the object as the distance viewed through the intermediate portion P or the near portion N. As another example, a clerk may ask the wearer what kind of distance he wants to use to view an object, and input the distance answered by the wearer as the distance viewed through the intermediate portion P or the near portion N. As another example, the wearer may actually place the object at a desired position for viewing, measure the distance between the wearer and the object, and use the distance. The method for obtaining the distance viewed by the wearer through the middle portion P or the near portion N is not particularly limited.

The formula data acquisition unit 211 acquires the spherical power, cylindrical power, astigmatism axis angle and formula addition of the wearer's right eye and left eye through the input unit 204. The formula data acquisition unit 211 enables the value of the formula addition to be stored in the storage unit 201 or in an unillustrated memory that can communicate with the CPU of the control unit 210 (hereinafter, recorded as "stored in the computing device 200").

The distance acquisition unit 212 of the control unit 210 acquires the distance viewed by the wearer through the near portion N (hereinafter referred to as the first distance) and the distance viewed by the wearer through the middle portion P (hereinafter referred to as the second distance), and stores them in the computing device 200. The distance acquisition unit 212 stores the values input by the user viewing the input screen G1 through the input unit 204 in the computing device 200.

The calculation unit 300 calculates the values related to the optical characteristics of the eyeglass lens LS suitable for the wearer based on the formula data, the first distance and the second distance. In the following formulas, "×" represents the product.

The adjustment force calculation unit 310 calculates the adjustment force of the wearer based on the first distance and the formula addition. The adjustment force calculation unit 310 calculates the reciprocal of the first distance and the addition required to view the first distance. If the first distance is set to D1 (in cm) and the addition required to view the first distance is set to A1, then A1 is calculated according to the following formula (1).

A1=100/D1...(1)

Next, calculate the difference between the addition required to observe the first distance and the formula addition. If the difference is set as Di and the formula addition is set as Addp, the difference Di is calculated according to the following formula (2).

Di=A1-Addp...(2)

Assume that the difference Di is formulated in such a way that it is supplemented by 50% of the wearer's adjustment ability. Therefore, the wearer's adjustment ability Ac is calculated according to the following formula (3).

Ac=2×Di...(3)

Furthermore, here, it is assumed that the difference is formulated in such a way that it is compensated by 50% of the wearer's adjustment ability, but a properly set value such as 40% or 60% may also be used.

When the adjustment force Ac calculated according to the above formulas (1), (2) and (3) becomes a negative value, the calculation unit 300 interrupts the calculation process. Thereafter, the display control unit 214 causes the display unit 203 to display a screen for letting the user know that a calculation error has occurred. For example, the display unit 203 may display a message such as "the hand distance is too far relative to the addition degree" on the screen.

The adjustment force calculation unit 310 stores the value of the adjustment force Ac in the calculation device 200 when the adjustment force Ac of the wearer calculated according to the above formulas (1), (2) and (3) becomes a positive value.

The addition calculation unit 320 calculates the addition and addition rate of the suitable wearer at the middle part P according to the prescription data, the first distance and the second distance. The addition is a value based on the distance reference point FV. The addition rate is a value obtained by dividing the addition of a certain height on the main sight line M of the eyeglass lens by the addition of the near reference point NV based on the distance reference point FV.

FIG. 4 is a graph showing an addition curve CA of the eyeglass lens LS. In the graph of FIG. 4 , the horizontal axis shows the value of the addition, and the vertical axis shows the height based on the eye point EP. The height of the distance reference point FV is Lf (refer to FIG. 2 ), and the height of the near reference point NV is -Ln. The area of the eyeglass lens LS corresponding to the height from -Ln to Lf corresponds to the middle part P. If the addition at the distance reference point FV is set to 0, the addition at the near reference point NV is set to Add, and the addition at the eye point EP is set to AddEP, then the addition rate EPP at the eye point EP is calculated according to the following formula (4).

EPP=AddEP/Add...(4)

In the example of FIG. 4 , the addition degree of each reference point is set in such a way that the addition degree curve CA1 of the portion of the middle portion P located above the eye point EP and the addition degree curve CA2 of the portion of the middle portion P located below the eye point EP have different slopes, but the addition degree curves CA1 and CA2 may also have the same slope.

The addition calculation unit 320 calculates the addition AddEP and the addition rate EPP added to the eye point EP of the middle part P based on the second distance and the accommodation force Ac calculated by the accommodation force calculation unit 310 according to the formula data and the first distance. The addition AddEP at the eye point EP is set in such a way that the wearer uses 50% of the accommodation force to view the second distance. Therefore, if the second distance is set to D2 (in cm), AddEP is calculated according to the following formula (5).

AddEP=100/D2-Ac/2...(5)

When the value obtained by the addition calculation unit 320 according to formula (5) is negative, the addition AddEP at the eye point EP is set to 0.

Furthermore, here, the addition AddEP at the eye point EP is set in such a way that the wearer uses 50% of the accommodation power to view the second distance D2, but an appropriate setting value such as 40% or 60% may also be used.

The addition calculation unit 320 calculates the addition rate EPP at the eye point EP according to the formula (4). When the addition rate EPP at the eye point EP calculated by the addition calculation unit 320 is greater than a predetermined threshold and less than 50%, the display control unit 214 causes the display unit 203 to display a screen for recommending a near-mid-range lens to the user. The display unit 203 may display a message such as "recommended near-mid-range lens" on the screen. When the addition rate EPP at the eye point EP calculated by the addition calculation unit 320 does not reach the predetermined threshold, the display control unit 214 causes the display unit 203 to display a screen for recommending a near-mid-range lens to the user. The display unit 203 can display a message such as "Recommended near and far lenses" on the screen. The above-mentioned predetermined threshold is set to a range of 10% or more and 15% or less, for example, 10%, 15%, etc.

Furthermore, the addition calculation unit 320 can also be configured to calculate either the addition AddEP or the addition rate EPP at the eye point EP and store it in the computing device 200.

The distance calculation unit 330 of the calculation unit 300 calculates the distance from the wearer to the far point (hereinafter referred to as the first far point distance) and the distance from the wearer to the near point (hereinafter referred to as the first near point distance) when the wearer views through the near portion N, and the distance from the wearer to the far point (hereinafter referred to as the second far point distance) and the distance from the wearer to the near point (hereinafter referred to as the second near point distance) when the wearer views through the middle portion P, based on the formulation addition degree and the accommodative force Ac calculated by the accommodative force calculation unit 310. The depth direction indicates the direction along the line of sight toward the front of the wearer. Here, the point at which the wearer can see clearly without adjusting the eyes when looking through a certain position of the eyeglass lens LS is called the far point, and the point at which the wearer can see clearly by adjusting the eyes to the maximum extent is called the near point.

Furthermore, the distance calculation unit 330 does not calculate all of the first far point distance, the first near point distance, the second far point distance, and the second near point distance, but only needs to calculate at least one.

FIG5(A) is a conceptual diagram for explaining the far point and the near point. In FIG5(A) and FIG5(B), for easy understanding, the objects Ob1 and Ob2 are respectively shown at the positions of the first distance D1 and the second distance D2 from the wearer Wr. Strictly speaking, the first distance D1 and the second distance D2 are preferably set to the distance from the cornea of the wearer Wr. The same applies to the distances shown in FIG5(A) and the third distance described below.

FIG5(A) shows the far point F1 and near point N1 when the wearer Wr views through the near reference point NV of the eyeglass lens LS. The distance calculation unit 330 calculates the first far point distance Df1 and the first near point distance Dn1 based on the formula addition Addp and the accommodative force Ac calculated by the accommodative force calculation unit 310. The distance calculation unit 330 calculates the first far point distance Df1 (in cm) when viewing through the near reference point NV based on the formula addition Addp using the following formula (6).

Df1=100/Addp...(6)

The distance calculation unit 330 is set to calculate the first near point distance Dn1 (in cm) when the wearer Wr uses the accommodative force Ac to the maximum extent according to the following formula (7) when viewing through the near reference point NV.

Dn1=100/(Addp+Ac)...(7)

FIG5(A) shows the far point F2 and near point N2 when the wearer Wr views through the eye point EP located at the middle part P of the eyeglass lens LS. The distance calculation unit 330 calculates the second far point distance Df2 and the second near point distance Dn2 based on the addition AddEP at the eye point EP calculated by the addition calculation unit 320 and the accommodative force Ac calculated by the accommodative force calculation unit 310. The distance calculation unit 330 calculates the second far point distance Df2 (in cm) when viewing through the eye point EP based on the addition AddEP at the eye point EP by the following formula (8).

Df2=100/AddEP...(8)

The distance calculation unit 330 is set to calculate the second near point distance Dn2 (in cm) when viewing through the eye point EP according to the following formula (12) when the wearer Wr uses the accommodative force Ac to the maximum extent.

Dn2=100/(AddEP+Ac)...(9)

The distance calculation unit 330 stores the calculated first far point distance Df1 and first near point distance Dn1, as well as the second far point distance Df2 and second near point distance Dn2 in the calculation device 200.

The range calculation unit 340 of the calculation unit 300 calculates the clear vision range and the object clear vision range according to the formula data and the first distance D1 or the second distance D2.

FIG5(B) is a conceptual diagram for explaining the clear vision range and the object clear vision range. On the right side of FIG5(B), a smartphone is shown as an example of the object Ob1 viewed or to be viewed at a position of the first distance D1 from the wearer Wr, and a laptop is shown as an example of the object Ob2 viewed or to be viewed at a position of the second distance D2. On the left side of FIG5(B), an example of the astigmatism distribution 400 of the eyeglass lens LS is shown. The dotted line extending in the substantially vertical direction in the astigmatism distribution 400 represents the main gaze line M.

The horizontal range of the spectacle lens LS in which the aberration of the near reference point NV is less than a predetermined value is called the first clear vision range W1. The range at the first distance D1 that can be viewed through the first clear vision range W1, in other words, the range of the object Ob1 located at the first distance D1 that can be viewed through the first clear vision range W1 is called the first object side clear vision range Wn. The horizontal range of the spectacle lens LS in which the aberration of the eye point EP is less than a predetermined value is called the second clear vision range W2. The range at the second distance D2 that can be viewed through the second clear vision range W2, in other words, the range of the object Ob2 located at the second distance D2 that can be viewed through the second clear vision range W2 is called the second object side clear vision range Wp. Regarding the above-mentioned aberrations and predetermined values, for example, as in the first clear vision range W1 and the second clear vision range W2 in FIG. 5 (B), the astigmatism can be set to less than 1.0D, but there is no particular limitation on the type and value of the aberration.

The range calculation unit 340 calculates the first clear vision range W1 and the second clear vision range W2 based on the data obtained by designing the eyeglass lens LS in a manner that the refractive power on the lens surface is continuously connected according to the set addition curve CA (Figure 4). The data does not necessarily require the actual design of the eyeglass lens for the set addition curve. For example, data corresponding to the addition AddEP of the eye point EP and the addition calculation formula or table of the near reference point NV can be pre-stored in the storage unit 201 according to the characteristics of each model of the eyeglass lens. The range calculation unit 340 can calculate the first clear vision range W1 and the second clear vision range W2 based on the data and the additions.

The range calculation unit 340 calculates the first object side clear vision range Wn and the second object side clear vision range Wp based on the calculated first clear vision range W1 and second clear vision range W2. The range calculation unit 340 refers to the values of the distance from the rotation point of the eyeball to the lens surface of the eyeglass lens and the distance from the rotation point to the cornea stored in the storage unit 201. Such values can use the average value obtained for each race, etc., but can also be obtained by actually measuring the wearer Wr.

FIG6 is a conceptual diagram for explaining the distance required for calculating the first object side vision range Wn and the second object side vision range Wp. The distance from the rotation point Cr of the eyeball Eb to the lens surface of the eyeglass lens LS is set as DL, and the distance from the rotation point Cr of the eyeball Eb to the cornea Cn is set as L1. The distance L1 is, for example, a standard value of 1.3 cm. Using the distance DL and the distance L1 and the first distance D1 or the second distance D2, the first object side vision range Wn and the second object side vision range Wp are calculated according to the following formulas (10) and (11).

Wn=W1×(D1+L1)/DL...(10)

Wp=W2×(D2+L1)/DL...(11)

The range calculation unit 340 stores the calculated first clear viewing range W1, second clear viewing range W2, first object side clear viewing range Wn, and second object side clear viewing range Wp in the calculation device 200.

The image generation unit 213 generates an image for providing the user or the like with the addition AddEP at the eye point EP, the first far point distance Df1, the first near point distance Dn1, the second far point distance Df2, and the second near point distance Dn2, as well as information about the first object side vision range Wn and the second object side vision range calculated by the calculation unit 300. Hereinafter, this image is referred to as an information providing image.

FIG. 7 is a diagram showing the information providing image G2. The information providing image G2 includes a basic information display section 41, an addition degree information display section 42, an addition rate information display section 43, a far-viewing part information display section 50, a middle-viewing part information display section 60, and a near-viewing part information display section 70.

Furthermore, the rectangle drawn with dotted lines in the information providing image G2 of FIG. 7 does not constitute an image. Moreover, the information providing image G2 of FIG. 7 is an example, and as long as the information obtained in the calculation of the calculation unit 300 can be displayed, the arrangement of the pattern and each element is not particularly limited.

The basic information display section 41 is an image section that uses numerical values to represent the spherical power (S), cylindrical power (C) and astigmatism axis (AX) for the right eye (R) and the left eye (L). The addition information display section 42 is an image section that uses numerical values to represent the addition Add of the near reference point NV based on the far reference point FV. The addition rate information display section 43 is an image section that expresses the addition rate EPP at the eye point EP in percentage.

Furthermore, the expression of each value in the information providing image G2 is not particularly limited as long as it can convey the magnitude of each value to the user, etc. For example, the unit is not limited to the user shown in Figure 7.

The telescopic information display section 50 is an image portion showing information about the telescopic part F. In the telescopic information display section 50, in the lens image 51, the position of the telescopic reference point FV is indicated by a dotted circle 52. The distance viewed at the telescopic reference point FV, i.e., the third distance (inside the dotted rectangle 54), is displayed by establishing a correspondence between the circle 52 and the dotted line 53. The third distance is set to indicate the distance at which the wearer Wr is expected to view an object through the telescopic part F or the distance he or she wishes to view. The addition at the telescopic reference point FV is 0 due to the complete correction by the spherical power and the cylindrical power, so the third distance becomes infinite here.

The middle part information display section 60 is an image portion showing information about the middle part P. In the middle part information display section 60, the position of the eye point EP is shown by a cross-shaped mark 62 in the lens image 61. The second distance D2 (inside the dotted rectangle 64) is displayed by establishing a correspondence between the mark 62 and the dotted line 63. The image of the object Ob2 is shown in correspondence with the value indicating the second distance D2. A bidirectional arrow 65 extending in the horizontal direction is shown in a manner overlapping with the image of the object Ob2, and the value of the second object side clear vision range Wp is shown inside the bidirectional arrow 65. An upward arrow 66 is shown on the upper side of the image of the object Ob2. The upward arrow 66 is a line portion that tapers upward and extends from near to far as in the telemetry. The value of the second far point distance Df2 is shown in correspondence with the upward arrow 66. A downward arrow 67 is shown below the image of the object Ob2. The downward arrow 67 is a line portion that tapers upward and extends from far to near as in the telemetry. The value of the second near point distance Dn2 is shown in correspondence with the downward arrow 67.

In the middle information display section 60, the second object side clear vision range Wp, the second near point distance Dn2 and the second far point distance Df2 are respectively shown using a bidirectional arrow 65, an upward arrow 66 and a downward arrow 67 in correspondence with the object Ob2 viewed or intended to be viewed through the middle section P. In this way, the wearer or other user can easily and clearly recognize the extent of the range of clear vision when viewing the object at the second distance D2 through the eyeglass lens LS.

The near part information display section 70 is an image portion showing information about the near part N. In the near part information display section 70, the position of the near reference point NV is shown by a dotted circle 72 in the lens image 71. The first distance D1 is shown by establishing a correspondence between the circle 72 and the dotted line 73 (inside the dotted rectangle 74). The image of the object Ob1 is shown in correspondence with the value representing the first distance D1. A bidirectional arrow 75 is shown in a manner overlapping with the image of the object Ob1, and the value of the first object side clear vision range Wn is shown inside the bidirectional arrow 75. An upward arrow 76 is shown on the upper side of the image of the object Ob1. The upward arrow 76 is a line portion that tapers upward and extends from near to far as in the telemetry. The value of the first far point distance Df1 is shown in correspondence with the upward arrow 76. A downward arrow 77 is shown below the image of the object Ob1. The downward arrow 77 is a line portion that tapers upward and extends from far to near as in the telemetry. The value of the first near point distance Dn1 is shown in correspondence with the downward arrow 77.

In the near vision part information display part 70, the first object side clear vision range Wn, the first far point distance Df1 and the first near point distance Dn1 are respectively shown using a bidirectional arrow 75, an upward arrow 76 and a downward arrow 77 in correspondence with the object Ob1 viewed or to be viewed through the near vision part N. In this way, the wearer or other user can easily and clearly recognize the extent of the clear vision range when viewing the object at the first distance D1 through the eyeglass lens LS.

Returning to FIG. 1 , the display control unit 214 causes the input screen G1 and the information providing image G2 generated by the image generating unit 213 to be displayed on the display unit 203 .

FIG8 and FIG9 are flowcharts showing the calculation method of the present embodiment and the image generation method, information providing method, spectacle lens design method and spectacle lens manufacturing method of the present embodiment. In step S101, the prescription data acquisition unit 211 acquires the prescription data of the wearer Wr. After step S101 is completed, step S103 is started. In step S103, the distance acquisition unit 212 acquires the first distance D1 and the second distance D2. After step S103 is completed, step S105 is started.

In step S105, the accommodative force calculation unit 310 calculates the accommodative force Ac of the wearer Wr. After step S105 is completed, step S107 is started. In step S107, the addition calculation unit 320 calculates the addition AddEP and the addition rate EPP at the eye point EP. After step S107 is completed, step S109 is started.

In step S109, the distance calculation unit 330 calculates the far point distance and the near point distance. Hereinafter, when the first far point distance Df1 and the second far point distance Df2 are not distinguished, they are referred to as far point distances, and when the first near point distance Dn1 and the second near point distance Dn2 are not distinguished, they are referred to as near point distances. After step S109 is completed, step S111 is started. In step S111, the range calculation unit 340 calculates the first and second object side vision ranges Wn and Wp. After step S111 is completed, step S113 is started.

In step S113, the image generation unit 213 generates the information providing image G2, and the display control unit 214 displays the information providing image G2 on the display unit 203. After step S113 is completed, step S201 (Figure 9) starts.

In step S201 of FIG. 9 , the unillustrated eyeglass lens design device obtains information for eyeglass lens design based on the response of the wearer Wr who has been prompted with the information providing image G2. Here, the information for eyeglass lens design refers to information related to the determined spherical power, cylindrical power, astigmatism axis, addition Add at the near reference point NV, addition AddEP at the eye point EP, and frame. The information for eyeglass lens design is sent to the eyeglass lens design device from, for example, an eyeglass store via an unillustrated eyeglass lens ordering device and an eyeglass lens order receiving device. After step S201 is completed, step S203 begins.

In step S203, the ophthalmic lens design device designs each part of the ophthalmic lens LS in a manner that the refractive power is continuously connected based on the information obtained for the ophthalmic lens design. After step S203 is completed, step S205 is started. In step S205, the ophthalmic lens processing device (not shown) manufactures the designed ophthalmic lens LS. After step S205 is completed, the processing is terminated.

Furthermore, the manufactured eyeglass lens LS is sold to the wearer Wr in an eyeglass store. The eyeglass lens selling method of this embodiment includes the step of presenting the information providing image G2 generated by the above-mentioned image generating method to the wearer Wr. In this way, the eyeglass lens LS suitable for the wearer Wr can be provided in accordance with the viewing distance of the wearer Wr through the near part N and the middle part P.

According to the above implementation form, the following effects can be obtained.

(1) The calculation method of the present embodiment is a method for calculating values related to the optical properties of an eyeglass lens LS having a near portion N, a distance portion F for viewing a distance longer than the distance viewed through the near portion N, and an intermediate portion P disposed between the near portion N and the distance portion F, and includes the following steps: obtaining prescription data of a wearer Wr; obtaining a first distance D1, which is a distance viewed through the near portion N, and a second distance D2, which is a distance viewed through the intermediate portion P by the wearer Wr; and calculating an addition AddEP or addition rate EPP at the intermediate portion P suitable for the wearer Wr to view the second distance D2 based on the prescription data, the first distance D1, and the second distance D2. In this way, a spectacle lens LS suitable for the wearer Wr can be provided in accordance with the viewing distance of the wearer Wr through the near portion N and the middle portion P.

(2) In the calculation method of this embodiment, the formula data includes the addition added to the near portion N, namely the formula addition Addp. The above calculation method includes the steps of calculating the accommodative force Ac of the wearer Wr based on the first distance D1 and the formula addition Addp, and calculating the addition AddEP or the addition rate EPP at the middle portion P based on the accommodative force Ac and the second distance D2. In this way, the eyeglass lens LS suitable for the wearer Wr can be provided without measuring the accommodative force Ac of the wearer Wr.

(3) In the calculation method of this embodiment, based on the formula addition Addp and the calculated accommodative force Ac, at least one of the distance Df1 from the wearer Wr to the far point F1 and the corresponding distance Dn1 from the wearer Wr to the near point N1 when the wearer Wr views through the near part N can be calculated. In this way, information related to the range of the wearer Wr's clear vision through the near part N in the front direction of the wearer Wr can be provided.

(4) In the calculation method of this embodiment, based on the addition AddEP or addition rate EPP at the middle part P and the calculated accommodative force Ac, at least one of the distance Df2 from the wearer Wr to the far point F2 and the distance Dn2 from the wearer Wr to the near point N2 when the wearer Wr views through the middle part P can be calculated. In this way, information related to the range of the wearer Wr's clear vision through the middle part P in the front direction of the wearer Wr can be provided.

(5) The calculation method of this embodiment includes the following steps, namely, based on the prescription data and the first distance D1 or the second distance D2, calculating the range of the object that the wearer Wr can view through the near part N or the middle part P with the aberration below a predetermined value, that is, the object side clear vision range Wn, Wp. In this way, information related to the range of the wearer Wr's clear vision in the left and right directions of the eyeglass lens LS can be provided.

(6) The image generation method of this embodiment includes the following steps: obtaining the values related to the optical characteristics calculated by the above calculation method, namely, the addition AddEP or addition rate EPP at the eye point EP, the near vision length Ln1, Ln2, the far point distance or the near point distance or the object side vision range Wn, Wp; and based on the above values, generating an information providing image G2 containing information about the above optical characteristics. In this way, information related to the range of vision that the wearer Wr can see can be easily and clearly provided through vision.

(7) The eyeglass lens design method of this embodiment includes the following steps: presenting the information providing image G2 generated by the above-mentioned image generation method to the wearer Wr; and designing the eyeglass lens LS based on the information obtained from the wearer Wr who has viewed the information providing image G2. In this way, the eyeglass lens LS suitable for the wearer Wr can be provided in accordance with the viewing distance of the wearer Wr through the near part N and the middle part P.

(8) The manufacturing method of the eyeglass lens of this embodiment manufactures the eyeglass lens LS designed by the above-mentioned eyeglass lens design method. In this way, the eyeglass lens LS suitable for the wearer Wr can be provided in accordance with the viewing distance of the wearer Wr through the near portion N and the middle portion P.

(9) The eyeglass lens LS of this embodiment is manufactured using the above-mentioned eyeglass lens manufacturing method. Thus, the wearer Wr can comfortably view objects at a distance that the wearer Wr can view through the near portion N and the intermediate portion P through the eyeglass lens LS.

(10) The calculation device of this embodiment includes: a formula data acquisition unit 211, which acquires the formula data of the wearer Wr; a distance acquisition unit 212, which acquires the distance viewed by the wearer Wr through the near portion N, i.e., the first distance D1, and the distance viewed through the middle portion P, i.e., the second distance D2; and an addition calculation unit 320, which calculates the addition AddEP or addition rate EPP at the middle portion P suitable for the wearer Wr to view the second distance D2 based on the formula data, the first distance D1, and the second distance D2. In this way, a spectacle lens LS suitable for the wearer Wr can be provided in accordance with the distance viewed by the wearer Wr through the near portion N and the middle portion P.

The following variations are also within the scope of the present invention and can be combined with the above-mentioned embodiments.

(Variant 1)

In the above-mentioned implementation form, the display unit 203 and the input unit 204 can also be integrated into a touch panel to input the formula data, the first distance D1 and the second distance D2 and other values required for the calculation processing of the calculation unit 300.

FIG10 is a three-dimensional diagram of the computing device 200 of this variant. The computing device 200 is configured as a portable device such as a tablet. The computing device 200 is, for example, a mobile terminal, a personal computer (hereinafter referred to as a PC), or a terminal device wirelessly connected to a PC. The computing device 200 has a touch panel 241 and a computing device body 242 equipped with the touch panel 241. The touch panel 241 functions as an input-output interface having the functions of an input unit 204 and a display unit 203. If the computing device 200 is configured as a portable device, not only the clerk in the eyewear store, but also the wearer Wr can confirm and directly input the information provided image G2 at hand, which is preferred.

(Variant 2)

In the above-mentioned embodiment, the values related to the optical characteristics of the eyeglass lens LS can also be calculated based on the distance (third distance) viewed by the wearer Wr through the farsighted part F.

The distance acquisition unit 212 acquires the third distance based on the input from the input unit 204 and stores it in the computing device 200.

FIG. 11 is a graph showing the added degree curve when the spherical power of the reference point FV is changed in accordance with the third distance. The added degree curve CA10 shows an example when the third distance is infinite, and the added degree curve CA20 shows an example when the third distance is changed to a finite value.

The addition power calculation unit 320 changes the value of the spherical power S from the value of the formula data (here, the third distance is infinite) according to the following formula (12), so that the wearer Wr can view the third distance through the far-sighted part F without adjustment. The changed S is set to S*, and the unit of the third distance D3 is set to m.

S*=S+1/D3...(12)

For example, when the spherical degree in the recipe data is -3.00 and the third distance D3 is 4m (0.25D), the addition calculation unit 320 sets the spherical degree value to -2.75.

The addition calculation unit 320 recalculates the addition Add at the near reference point NV according to the following formula (13).

Add=Addp-1/D3...(13)

Since the value of the addition is based on the remote reference point FV, if the third distance D3 changes from infinity to 4m, the point where the addition becomes 0 moves from O1 to O2 (=O1-0.25) on the horizontal axis of the curve in Figure 11. Since the addition Add becomes the value from O1 or O2 to the formula addition Addp, if the third distance D3 changes from infinity to 4m, the addition Add decreases by 0.25. If the third distance D3 changes from infinity to 4m, the addition curve CA10 changes to the addition curve CA20 and is set.

The addition calculation unit 320 calculates the addition AddEP and the addition rate EPP at the eye point EP again in accordance with the change of the point that becomes the reference of the addition Add from O1 to O2. The addition AddEP* and the addition rate EPP* at the eye point EP after the change are obtained according to the following formula (14) and formula (15) respectively.

AddEP*=AddEP-1/D3...(14)

EPP*=AddEP*/Add...(15)

In this case, although the addition and addition rate at the eye point EP change, the refractive power at the eye point EP and the near reference point NV does not change.

If the third distance D3 becomes shorter, the point O2 that becomes the reference of the addition Add after the change moves to the right on the horizontal axis of the curve diagram of FIG. 11, and the addition rate EPP* becomes less than the predetermined value. In this case, the calculation unit 300 can terminate the calculation related to the optical characteristics of the third distance D3. The above-mentioned predetermined threshold value is set to a range of 10% to 15%, for example, it can be set to 10%, 15%, etc.

The range calculation unit 340 recalculates the first clear vision range W1, the second clear vision range W2, the first object side clear vision range Wn, and the second object side clear vision range Wp according to the addition curve CA20 calculated by the addition calculation unit 320 based on the third distance D3.

The image generation unit 213 generates an information providing image, which includes information related to the numerical values of the optical characteristics of the eyeglass lens LS calculated by the addition calculation unit 320 and the range calculation unit 340 based on the third distance D3. The numerical values include the addition AddEP* and addition rate EPP* at the above-mentioned eye point EP, the first object side vision range Wn, and the second object side vision range Wp.

FIG12 is an information providing image G3 when the third distance D3 is infinite (before the change). Since the third distance D3 is infinite, the values related to the optical characteristics of the eyeglass lens LS in the information providing image G3 are the same as those in FIG7.

The information providing image G3 is different from the information providing image G2 of the above-mentioned implementation form in that it has a third distance input unit 500, and further has a remote information display unit 50a instead of the remote information display unit 50.

The third distance input unit 500 has a slider 501, a value selection mark 502, and a decision icon 511. The third distance D3 to be input is selected according to the position of the value selection mark 502 on the slider 501. In the examples of FIG. 12 and FIG. 13, it is set as follows, that is, on the slider, the value of the third distance D3 decreases as it moves to the left, and the value of the third distance D3 increases as it moves to the right. The value selection mark 502 can be moved by dragging the mouse or by drawing on the touch panel. The value of the selected third distance D3 is displayed in the dashed rectangle 512, and the value is input as the third distance D3 by clicking the decision icon 511, etc.

The telescopic information display unit 50a indicates the position of the telescopic reference point FV with a dotted circle 52, and establishes a correspondence between the circle 52 and the dotted line 53 to show the minimum value of the third distance D3 (inside the dotted rectangle 55). Furthermore, the maximum value of the third distance D3 (inside the dotted rectangle 56) is shown in the telescopic information display unit 50a. These minimum and maximum values are obtained in advance by calculating the addition rate EPP and EPP* at the eye point EP for a plurality of third distances D3 using the addition rate calculation unit 320, and finding the minimum and maximum values of the third distance D3 with the addition rate EPP and EPP* within a predetermined range. The range of values that can be selected by the above-mentioned slider 501 is preferably set to a value between the minimum and maximum values.

FIG. 13 is an information providing image G4 when the third distance D3 is 1m. Information providing image G4 is an image obtained by clicking the decision icon 511 after the value selection mark 502 is moved to the left end, thereby inputting 1m as the third distance D3. Compared with the information providing image G3, the third distance D3 in the information providing image G4 changes from infinity to 1m, so the spherical power (S) indicated in the basic information display section 41, the addition AddEP* at the eye point EP indicated in the addition information display section 42, the addition rate EPP* indicated in the addition rate information display section 43, the first object side vision range Wn, and the second object side vision range Wp change.

The information provided images G3 and G4 are configured so that the wearer Wr and other users can appropriately change the third distance D3, and the updated addition AddEP*, the first object side vision range Wn, and the second object side vision range Wp are displayed at any time along with the change. In this way, the user can compare the distance that can be clearly seen using the far vision part F with the range that can be clearly seen using the middle part P and the near part N, and select the eyeglass lens LS with the desired appearance.

Furthermore, when the input unit 204 is composed of a touch panel 241 as shown in Modification 1, the wearer Wr or other users can easily set the third distance D3 by tracing the slide bar 501 of the touch panel 241 to move the numerical selection mark 502 or touching the slide bar 501 to move the numerical selection mark, which is preferred.

FIG. 14 and FIG. 9 are flowcharts showing the calculation method of this variant and the image generation method, information provision method, spectacle lens design method and spectacle lens manufacturing method of this variant. Steps S301 to S305 are the same as steps S101 to S105 of the flowchart of FIG. 8 , so the description is omitted. After step S305 is completed, step S307 is started.

In step S307, the range calculation unit 340 calculates the addition AddEP, AddEP* and the addition rate EPP, EPP* at the eye point EP based on the third distance D3. After step S307 is completed, step S309 is started. In step S309, the distance calculation unit 330 calculates the far point distance and the near point distance. After step S309 is completed, step S311 is started.

In step S311, the range calculation unit 340 calculates the object side vision range (the first object side vision range Wn and the second object side vision range Wp) based on the third distance D3. After step S311 is completed, step S313 is started. In step S313, the image generation unit 213 generates the information providing image G3 or G4, and the display control unit 214 displays the information providing image G3 or G4 on the display unit 203. After step S313 is completed, step S315 is started.

In step S315, the control unit 210 determines whether an instruction to end the display of the information providing image G3 or G4 has been input. When the instruction has been input, the control unit 210 makes an affirmative determination on step S315 and starts step S201 (Figure 9). Step S201 and the subsequent processing are the same as the above-mentioned implementation form, so the description is omitted. When the instruction has not been input, the control unit 210 makes a negative determination on step S and starts step S317. In step S317, the distance acquisition unit 212 acquires the third distance D3. After step S317 is completed, it returns to step S307.

(1) The image generation method of this variant includes the step of obtaining the third distance D3, which is the distance that the wearer Wr views through the distance portion F, and calculating the optical property-related values such as the addition AddEP* and addition rate EPP* at the eye point EP, and the first object side vision range Wn and the second object side vision range Wp based on the third distance D3. In this way, a spectacle lens LS suitable for the wearer Wr can be provided in accordance with the distance that the wearer Wr views through the distance portion F and the distance that the wearer views through the near portion N and the intermediate portion P.

(2) In the image generation method of this variant, the information providing images G3 and G4 include screen components for inputting the third distance D3, namely, a slide bar 501 and a numerical selection mark 502. In this way, the distance viewed from the near part N can be input while viewing information related to the middle part P or the near part N of the eyeglass lens LS.

(3) In the image generation method of this variant, the information on the optical characteristics and the above-mentioned slide bar 501 and the numerical selection mark 502 can be displayed on the touch panel 241, and the value of the third distance D3 input by touching or drawing the above-mentioned slide bar 501 and the numerical selection mark 502 in the touch panel 241 changes, and based on the change of the value of the third distance D3, an updated information providing image G3 or G4 is generated. In this way, the change of the information related to the optical characteristics of the eyeglass lens LS can be checked while the third distance D3 is changed, so that the information related to the eyeglass lens LS can be provided more simply and easily.

(Variant 3)

In the above-mentioned implementation form, when the prescription data includes the degree of astigmatism, the spherical degree (S) can be set based on the degree of astigmatism.

FIG. 15 is a diagram showing the input screen G1a of this variation. In the input screen G1a, in addition to the screen components displayed in the input screen G1, the seventh screen components 37R and 37L are also displayed. The seventh screen components 37R and 37L are text blocks for inputting the astigmatism degree for the right eye and the left eye respectively. The recipe data acquisition unit 211 acquires the astigmatism degree input in the seventh screen components 37R and 37L and stores it in the calculation device 200.

The addition calculation unit 320 calculates the parameters RSx and LSx according to the following formula (16) and formula (17) respectively based on the cylindrical power and the spherical power of the wearer. The cylindrical power of the right eye and the left eye are set to RC and LC respectively, and the spherical power of the right eye and the left eye are set to RCs and LCs respectively.

RSx=(RC-RCs)/2...(16)

LSx=(LC-LCs)/2...(17)

Furthermore, values less than 0.25 in diopter units may be appropriately rounded off.

The addition power calculation unit 320 can display the values obtained by adding RSx and LSx to the spherical powers of the right eye and the left eye obtained after setting the spherical power based on the third distance D3 in the above-mentioned modification 2 as the spherical power of the right eye and the left eye in the information providing image G3 or G4. In this way, a more suitable eyeglass lens LS for the wearer Wr can be provided based on the astigmatism degree of the wearer.

(Variant 4)

The program for realizing the information processing function of the evaluation device 200 may also be recorded on a recording medium readable by a computer, so that the computer system reads and executes the above-mentioned calculation processing and image generation processing and the program related to the control of the related processing recorded in the recording medium. Furthermore, the "computer system" mentioned here includes the OS (Operating System) or the hardware of the peripheral device. In addition, the "recording medium readable by a computer" refers to portable recording media such as floppy disks, magneto-optical disks, optical disks, memory cards, and storage devices such as hard disks built into the computer system. Furthermore, "recording media readable by a computer" may also include a communication line that dynamically retains the program for a short period of time, such as when sending a program via a network such as the Internet or a communication line such as a telephone line, or a volatile memory in a computer system that serves as a server or client in the above situation that retains the program for a fixed period of time. In addition, the above program may be used to implement a part of the above function, and further, it may be used to implement the above function by combining with a program already recorded in the computer system.

Furthermore, when applied to a PC, etc., the above-mentioned control-related programs can be provided via a recording medium such as a CD-ROM, DVD-ROM, or a data signal of the Internet. FIG. 16 is a diagram showing the situation. PC 950 receives the program via CD-ROM 953. Furthermore, PC 950 has a connection function with a communication line 951. Computer 952 is a server computer that provides the above-mentioned program, and stores the program in a recording medium such as a hard disk. Communication line 951 is a communication line such as the Internet, personal computer communication, or a dedicated communication line. Computer 952 uses a hard disk to read out the program, and sends the program to PC 950 via communication line 951. That is, the program is transported as a data signal by a carrier and sent via communication line 951. In this way, the program can be provided in the form of a computer program product that can be read by a computer in various forms such as recording media or carrier waves.

The program for realizing the above-mentioned information processing function includes the following, which is a program for causing a processing device to perform calculation processing of numerical values related to the optical characteristics of the eyeglass lens LS, wherein the eyeglass lens LS has a near portion N, a distance portion F for viewing a distance longer than the distance viewed through the near portion N, and an intermediate portion P disposed between the near portion N and the distance portion F. The above-mentioned calculation processing includes: formula data acquisition processing (corresponding to step S101 of the flowchart of FIG. 8 and step S301 of the flowchart of FIG. 14), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S102 of the flowchart of FIG. 14), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S103 of the flowchart of FIG. 14), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S104 of the flowchart of FIG. 14), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S105 of the flowchart of FIG. 14), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S106 of the flowchart of FIG. 14), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S107 of the flowchart of FIG. 14), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S108 of the flowchart of FIG. 14), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S109 of the flowchart of FIG. 15), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S101 of the flowchart of FIG. 15), which acquires the formula data of the wearer Wr; distance acquisition processing (corresponding to step S109 of the flowchart of FIG. 15), which 8 and step S303 of the flowchart of FIG. 14), which obtains the distance viewed by the wearer Wr through the near part N, i.e., the first distance D1, and the distance viewed through the middle part P, i.e., the second distance D2; and the addition calculation processing (corresponding to step S107 of the flowchart of FIG. 8 and step S307 of the flowchart of FIG. 14), which calculates the addition AddEP, AddEP* or addition rate EPP, EPP* suitable for the wearer Wr to view the middle part P at the second distance D2 based on the formula data, the first distance D1 and the second distance D2.

The present invention is not limited to the contents of the above-mentioned implementation forms. Other aspects considered within the scope of the technical concept of the present invention are also included in the scope of the present invention.

The disclosure contents of the following priority application are incorporated into this article by reference.

Japanese Patent Application No. 2019-034630 (applied on February 27, 2019)

41: Basic information display section

42: Join the information display department

43: Join the rate information display department

50a: Remote use information display unit

51,61,71: Lens image

52,72: Dashed circle

53,63,73: dotted line

55,56,64,74: Rectangle of dotted lines

60: Middle information display section

62:Mark

65,75: Double-direction arrow

66,76: Upward arrow

67,77: Downward arrow

70: Nearby information display unit

500: 3rd distance input unit

501: Slider

502: Numerical selection tag

511: Decide on icon

512: Rectangle

Df1: 1st far point distance

Df2: 2nd farthest point distance

Dn1: 1st near point distance

Dn2: Second periapsis distance

G3: Information provided by the image

Ob1, Ob2: object

Wn: The first object’s visual range

Wp: Second object’s visual range

Claims (15)

A calculation method is a method for calculating values related to the optical properties of an eyeglass lens, wherein the eyeglass lens has a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and an intermediate portion disposed between the near portion and the distance portion, and the calculation method comprises the following steps: obtaining prescription data of a wearer; obtaining a first distance, which is a distance viewed through the near portion, and a second distance, which is a distance viewed through the intermediate portion; and calculating an addition or addition rate of the intermediate portion suitable for the wearer to view the second distance based on the prescription data, the first distance, and the second distance. The calculation method of claim 1, wherein the formula data includes the addition added to the near portion, i.e., the formula addition, and the calculation method includes the step of calculating the wearer's adjustment force based on the first distance and the formula addition, and calculating the addition or the addition rate of the middle portion based on the adjustment force and the second distance. The calculation method of claim 2 includes the following steps, namely, based on the above formula addition degree and the calculated above adjustment force, calculating at least one of the distance from the above wearer to the far point and the distance from the above wearer to the near point when the above wearer views through the above near portion. The calculation method of claim 2 or 3 includes the following steps, namely, based on the addition degree or the addition rate of the middle part and the calculated adjustment force, calculating at least one of the distance from the wearer to the far point and the distance from the wearer to the near point when the wearer views through the middle part. The calculation method of any one of claims 1 to 3 includes the following steps, namely, based on the formula data and the first distance or the second distance, calculating the range of the object that the wearer can view through the near portion or the middle portion where the aberration becomes below a predetermined value. A method for generating an image comprises the following steps: obtaining numerical values related to the optical properties of an eyeglass lens, the eyeglass lens having a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and a middle portion disposed between the near portion and the distance portion; and generating an image including information about the optical properties based on the numerical values; the numerical values including the addition or addition rate of the middle portion suitable for the wearer to view the second distance calculated based on the prescription data of the wearer, the distance viewed through the near portion, i.e., a first distance, and the distance viewed through the middle portion, i.e., a second distance. The image generation method of claim 6 includes the step of obtaining the distance viewed by the wearer through the distal portion, i.e., the third distance, and calculating a value related to the optical characteristic based on the third distance. As in claim 7, the image generation method, wherein the image includes a screen component for inputting the third distance. As in claim 8, the image generation method, wherein the information about the optical characteristics and the screen components are displayed on a touch panel, and the value of the third distance input by touching or drawing the screen components in the touch panel changes, and based on the change in the value of the third distance, the updated image is generated. A method for designing an eyeglass lens comprises the following steps: presenting an image generated by the image generation method of any one of claims 6 to 9 to a wearer; and designing the eyeglass lens based on information obtained from the wearer who has viewed the image. A method for manufacturing an ophthalmic lens, wherein the ophthalmic lens is designed using the ophthalmic lens design method of claim 10. An ophthalmic lens manufactured using the ophthalmic lens manufacturing method of claim 11. A method for selling eyeglass lenses, comprising the step of presenting an image generated by the image generation method of any one of claims 6 to 9 to a wearer. A calculation device for calculating values related to the optical characteristics of an eyeglass lens, wherein the eyeglass lens has a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and an intermediate portion disposed between the near portion and the distance portion, and the calculation device has: a prescription data acquisition portion for acquiring prescription data of a wearer; a distance An acquisition unit that acquires the distance viewed by the wearer through the near portion, i.e., the first distance, and the distance viewed through the middle portion, i.e., the second distance; and an addition calculation unit that calculates the addition or addition rate of the middle portion suitable for the wearer to view the second distance based on the formula data, the first distance, and the second distance. A program for performing calculation processing, which is used to enable a processing device to perform calculation processing on values related to the optical characteristics of a spectacle lens, the spectacle lens having a near portion, a distance portion for viewing a distance longer than the distance viewed through the near portion, and an intermediate portion disposed between the near portion and the distance portion, the calculation processing comprising: formula data acquisition processing, which acquires the wearer's formula data; distance acquisition processing, which acquires the distance viewed by the wearer through the near portion, i.e., the first distance, and the distance viewed through the middle portion, i.e., the second distance; and addition calculation processing, which calculates the addition or addition rate of the middle portion suitable for the wearer to view the second distance based on the formula data, the first distance, and the second distance.

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