EP2118703A1 - Realisation d'un element ophtalmique adapte pour les visions foveale et peripherique - Google Patents
Realisation d'un element ophtalmique adapte pour les visions foveale et peripheriqueInfo
- Publication number
- EP2118703A1 EP2118703A1 EP08762062A EP08762062A EP2118703A1 EP 2118703 A1 EP2118703 A1 EP 2118703A1 EP 08762062 A EP08762062 A EP 08762062A EP 08762062 A EP08762062 A EP 08762062A EP 2118703 A1 EP2118703 A1 EP 2118703A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wearer
- vision
- foveal
- optical power
- ophthalmic element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
- G02C7/027—Methods of designing ophthalmic lenses considering wearer's parameters
-
- G—PHYSICS
- G02—OPTICS
- G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
- G02C7/00—Optical parts
- G02C7/02—Lenses; Lens systems ; Methods of designing lenses
- G02C7/024—Methods of designing ophthalmic lenses
- G02C7/028—Special mathematical design techniques
Definitions
- the present invention relates to a method for producing an ophthalmic element for ametropia correction, which is adapted to correct the foveal and peripheral visions.
- a lens of glasses which is placed in front of his eye in a fixed manner with respect to his face, using a frame as a support for the lens.
- the central zone of the glass then serves mainly to correct the wearer's ametropia when the latter is looking straight ahead.
- the image of an object that is observed under these conditions is detected by a central area of the wearer's retina, called the foveal area. For this reason, the visual perception that corresponds to the direction of the gaze ahead is called foveal vision, or central vision.
- a goal of the ametropia correction which is achieved by the central zone of the spectacle lens therefore consists of bringing back the image of an object which is located in front of the spectacle wearer in the plane tangent to the retina in the foveal zone. .
- Such a correction is only approximate for certain observation conditions, in particular because the exact position of the image varies along the optical axis of the eye as a function of the observation distance of the object .
- the peripheral zone of the glass which is situated around the central zone of the latter, also participates in the formation of the image on the retina when the observer looks straight ahead, without turning his eyes, for parts of the eye. object that are eccentric.
- the parts of the image that correspond to the eccentric parts of the object are then located outside the foveal area, in the peripheral zone of the retina.
- the corresponding visual perception is called peripheral vision.
- the defect of position of the image on the retina when the wearer looks straight ahead can vary between the foveal vision and the peripheral vision. This variation depends on the shape of the wearer's eye and the retinal eccentricity. It varies, in general, for different carriers. For this reason, we distinguish for each carrier an ametropia in foveal vision and an ametropia in peripheral vision, to a given eccentricity, with two corresponding ametropia corrections.
- the direction of his gaze passes through the glass at a point in the peripheral zone.
- the optical characteristics of the glass at this point are then no longer suitable for forming an image on the retina along the viewing direction, that is to say along the optical axis of the eye that is rotated.
- the ametropia that occurs in these conditions along the optical axis of the eye is foveal vision ametropia, while the optical axis of the eye cuts the glass to a point where the correction of the vision that is realized corresponds to the peripheral vision.
- the ametropia correction that is made is then not adapted to these observation conditions, and the visual comfort of the wearer is reduced.
- An object of the present invention is then to provide a wearer with an ametropia correction which gives him good visual comfort while limiting or eliminating a long-term worsening of his ametropia.
- the invention proposes a method for producing an ophthalmic element for ametropia correction, which is adapted to correct the foveal and peripheral visions of a wearer of this element, and which comprises the steps following:
- the amplitude of the eye movements of the wearer which is characterized in step / 1 / is used to determine, in step / 3 /, a size of the central zone of the ophthalmic element in which correction of the foveal vision is performed.
- This central zone size with foveal vision correction increases according to the amplitude of the eye movements of the wearer.
- center of the ophthalmic element means a central point of the face of the latter, which corresponds to the intersection of this face with the direction of gaze of the right holder in front, for the position. of use of the ophthalmic element.
- the optical power of the ophthalmic element at this central point is equal to the correction which is determined for the foveal vision of the wearer.
- the optical power can vary continuously along the face of the ophthalmic element.
- the central zone of the element in which the correction of the foveal vision is made, is then understood to mean a portion of the element which is situated around the central point thereof, parallel to the face of the element, and wherein the optical power has an absolute deviation from the power value at the center point, which is less than a determined limit.
- This limit of the variations of the optical power inside the central zone of the ophthalmic element may be equal to 0.10 or 0.25 diopters, for example.
- the invention consists in taking into account a behavioral characteristic of the wearer to determine a compromise between the correction of the foveal vision and that of the peripheral vision. This behavioral characteristic is the propensity of the wearer to turn the head or the eyes more to observe an object that is not located in front of him.
- the invention therefore consists of an additional personalization of the ophthalmic element, beyond the correction of the vision of the wearer, to optimize the compromise between the ametropia corrections relating to the foveal vision and to the peripheral vision.
- the method of the invention provides a larger area of the ophthalmic element that corrects the foveal vision of the wearer.
- the image of an object that is observed by the wearer is correctly formed on the retina, for a higher range of angle of rotation of the eyes.
- a peripheral zone of the element which is larger is suitable for peripheral vision.
- a method according to the invention makes it possible to achieve an optimal compromise between the correction of the peripheral vision and that of the foveal vision, over the entire surface of the ophthalmic element.
- This compromise varies depending on the carrier.
- the compromise that is obtained provides a good foveal vision comfort for a wearer who mainly moves the eyes, while providing a correction of his peripheral vision near the periphery of the ophthalmic element.
- the method of the invention provides an increased correction of peripheral vision for a wearer who moves mainly the head. In this way, the wearer's comfort of correction and non-worsening of the peripopia are optimally combined for each wearer.
- FIGS. 1a and 1b illustrate a principle of measurement of eye and head movements for a spectacle wearer
- FIGS. 2a and 2b are optical power characterizations of a first spectacle lens made according to the invention, for a first wearer who moves the eyes more than the head;
- FIGS. 3a and 3b are characterizations of a second spectacle lens made according to the invention, for a second wearer who moves the head more than the eyes;
- FIGS. 4a, 4b and 5a, 5b respectively correspond to FIGS. 2a, 2b and 3a, 3b for an alternative embodiment of the invention.
- the invention is now described in detail in the context of the production of a corrective ophthalmic lens of the spectacle lens type. But it is understood that the invention can be applied to other ophthalmic elements that perform an ametropia correction, such as glasses of mountain masks or aquatic diving in particular.
- a spectacle lens that is adapted to perform myopia correction is taken as an example. But it is also understood that the invention can be applied in a similar manner to any corrective glass, whatever the nature of the wearer's ametropia.
- the relative magnitudes of eye and head movements for the future carrier to which the glass is intended are characterized.
- a first target called reference target
- the reference target is denoted R in Figure 1a. It is preferably located at eye level for the wearer. The wearer is therefore placed in front of the reference target, with the shoulders substantially located in a vertical plane that is perpendicular to the virtual line that connects his head to the reference target. He then has the head and the eyes that are oriented toward the reference target.
- the bearer is then asked to look at a second target, referred to as the test target and noted T, which is offset from the reference target, without moving the shoulders.
- the test target is horizontally offset from the reference target, so as to characterize the horizontal movements of the wearer's head and eyes.
- the angular offset of the test target relative to that of reference is called eccentricity, and denoted E.
- ⁇ r denotes the angle of rotation of the wearer's head, also called angular deflection of the head, to move from the first observation situation of the reference target to the second observation situation. of the test target.
- ⁇ ⁇ is the angle of rotation of the eyes that is performed simultaneously by the wearer.
- the eccentricity E is therefore equal to the sum of the two angles ⁇ 3 ⁇ and ⁇ ⁇ .
- the quotient of the angular deviation of the head ai by the eccentricity E is then calculated. This quotient is equal to unity for a wearer who has exclusively turned the head to pass from the reference target to the test target, and to zero for a wearer who has only turned his eyes.
- a G gain is then calculated for this "eye / head" motion coordination test that has been performed for the wearer.
- the gain G can be defined by a predetermined increasing function of the quotient of the angular deviation of the head ⁇ j by the eccentricity E.
- This "eye / head" movement coordination test can be performed by the wearer in the shop of an optician retailer where he orders his pair of glasses equipped with corrective glass.
- two carriers will be considered which require identical corrections of foveal vision, equal to -4.00 diopters.
- the first carrier has a gain value G equal to 0.1, indicating that it turns the eyes more than the head to observe an eccentric object, and the second carrier has a gain value G equal to 0.8, indicating that he turns his head more than the eyes under the same conditions.
- ametropia correction that is adapted to peripheral vision can be determined for each wearer by performing a measure on this one.
- a measure may be, in particular, a self-defeating or skiascopy measure.
- the ametropia correction for the peripheral vision of a wearer and for a fixed eccentricity can be determined by adding a constant value to the ametropia correction value which is determined for the foveal vision of this wearer.
- This constant value can be, in particular, +0.8 diopter, which corresponds to an average difference between the degree of myopia of a person in foveal vision and its degree of myopia for the peripheral vision, for an eccentricity of 30 °.
- G which is calculated for each wearer
- a central zone size of the lens in which the ametropia correction is made for the foveal vision is then determined.
- the central zone of the lens in which the ametropia correction is performed for the foveal vision may have any shape.
- its vertical diameter, relative to the position of use of the glass by the wearer may be smaller than its horizontal diameter.
- the vertical head movements generally have amplitudes that are smaller than those of the horizontal head movements, with respect to corresponding eye movements.
- This size of the central zone of the glass, in which the foveal vision correction is performed can be determined by means of a value of the optical power of the glass which is made at a point of the glass situated outside the zone. central of it. This point corresponds to a reference eccentricity. Since the optical power varies continuously from the correction value which is made at the optical center of the glass, a greater difference between the value of the optical power which is determined for the reference eccentricity and that which is realized at center of the glass corresponds to a smaller size of the central zone of the glass, in which the correction is adapted to the foveal vision of the wearer.
- the optical power value which is determined for the point of the glass located outside the central zone itself depends on the calculated gain for each carrier.
- the optical power of the glass which is evaluated for the reference eccentricity, and which is denoted PX can be determined using a first function predefined mathematical notation, denoted F 1 .
- This first function depends on the optical power PO of the glass evaluated in the center thereof for the foveal vision, the ametropia correction that has been determined for the peripheral vision of the wearer and the eccentricity considered, denoted PM, and the G gain that has been calculated for the wearer.
- PX Fi (PO, PM, G).
- the function Fi is such that a derivative of a first difference between the optical powers of the lens for peripheral vision at the eccentricity considered and for the foveal vision at the central point, with respect to a second difference between on the one hand, the ametropia correction determined for the peripheral vision of the wearer and the same eccentricity, and on the other hand the optical power of the lens for the foveal vision at the central point, is itself an increasing function of the calculated gain (G) .
- G calculated gain
- PX aG n (PM - PO) + P0 + b, where n is a strictly positive number, a and b are constant coefficients, a is positive.
- the optical power of the glass in the peripheral zone is determined from the optical power in the central zone, by modifying the latter on the basis of the correction which is determined for the peripheral vision of the wearer, and this with an amplitude which increases with the value of the eye / head movement coordination gain.
- Figures 2a and 2b are optical power mappings of a spectacle lens established for foveal vision and peripheral vision, respectively.
- the abscissa and ordinate axes are respectively marked by the angular offset values of the gaze with respect to the optical axis of the glass, respectively in a horizontal plane and in a vertical plane, for the position of use of the glass by the wearer. They are marked in degrees and denoted ALPHA and BETA, ALPHA denoting the offset in the vertical plane, and BETA in the horizontal plane.
- the null values of ALPHA and BETA correspond to the direction of look straight ahead, which passes through the center of the glass.
- the curves shown connect points for which the optical power is constant. This value is indicated on some of the curves.
- a displacement in a cartography established for the foveal vision corresponds to a rotation of the eye behind the glass
- a displacement in a mapping established for peripheral vision corresponds to a displacement in the image formed on the retina when the eye is motionless and looks through the center of the glass.
- FIGS. 3a and 3b respectively correspond to Figures 2a and 2b for a second glass which is intended for the second carrier presented above.
- the same values as above were adopted for parameters n, a and b.
- PX -3.56 diopters (FIG. 3b). Comparing FIGS. 2a and 3a, it can be seen that the central area of the glasses in which the optical power in foveal vision is substantially equal to -4.00 diopters is greater for the first carrier (FIG. 2a) than for the second carrier (FIG. Figure 3a).
- a second embodiment of the invention consists in determining the variation of the correction of the foveal vision when one moves radially on the glass from the optical center thereof.
- the optical power of the glass is determined for the foveal vision at a point on the glass surface which is located outside the central zone and which corresponds to a reference eccentricity.
- This power which is denoted PXC, can be determined by using a second predefined mathematical function denoted F 2 . This second function depends on the optical power
- the function F 2 is such that a derivative of a difference between the optical powers of the lens for the foveal vision, respectively for the reference eccentricity and at the central point, with respect to the value of DP power failure, is itself an increasing function of the gain G.
- PXC cG m DP + P0 + d, where m is a strictly positive number, c and d are constant coefficients, c is positive.
- the number m is equal to 1.0 and the coefficients c and d are respectively equal to 3.0 and 0.0.
- the tolerable defect of reference optical power DP is equal to 0.5 diopter and the reference eccentricity is still equal to 30 °.
- FIGS. 4a and 4b are optical power maps of a third lens that corresponds to this second mode of implementation of the invention, respectively for the foveal and peripheral visions.
- This third glass is intended for the first carrier, for which G is equal to 0.1.
- PXC is then equal to -3.85 diopters, for the numerical values which have been quoted above. This value is visible in FIG. 4a for the 30 ° reference eccentricity.
- Figure 4b shows that peripheral vision is corrected to a different extent with respect to foveal vision.
- FIGS. 5a and 5b correspond to FIGS. 4a and 4b, respectively, for a fourth lens also produced according to the second embodiment of the invention, but being intended for the second wearer, for which G is equal to 0.8 .
- PXC equals -2.60 diopters
- FIGS. 4a and 5a The comparison of FIGS. 4a and 5a shows that the central zone of the third lens which is intended for the first carrier is again larger than that of the fourth lens intended for the second carrier.
- Each glass is then produced by varying at least one curvature of a face thereof parallel to this face. For this, two curvatures are determined at each point of a mesh of the face from the corresponding optical power mapping, in a manner that is known per se.
- One of the processes for machining ophthalmic lenses that are also known to a person skilled in the art can then be used to impart to the face of the glass the determined variations in curvature.
- a refractive index of a glass material can be varied, still parallel to the face of the glass, to confer thereon local optical power characteristics which correspond to those determined for the central and peripheral areas.
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Ophthalmology & Optometry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Eyeglasses (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0701110A FR2912820B1 (fr) | 2007-02-15 | 2007-02-15 | Realisation d'un element ophtalmique adapte pour les visions foveale et peripherique |
| PCT/FR2008/050210 WO2008104695A1 (fr) | 2007-02-15 | 2008-02-12 | Realisation d'un element ophtalmique adapte pour les visions foveale et peripherique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2118703A1 true EP2118703A1 (fr) | 2009-11-18 |
Family
ID=38515353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08762062A Withdrawn EP2118703A1 (fr) | 2007-02-15 | 2008-02-12 | Realisation d'un element ophtalmique adapte pour les visions foveale et peripherique |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8079705B2 (fr) |
| EP (1) | EP2118703A1 (fr) |
| CN (1) | CN101663609B (fr) |
| FR (1) | FR2912820B1 (fr) |
| WO (1) | WO2008104695A1 (fr) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11428937B2 (en) | 2005-10-07 | 2022-08-30 | Percept Technologies | Enhanced optical and perceptual digital eyewear |
| US20070081123A1 (en) | 2005-10-07 | 2007-04-12 | Lewis Scott W | Digital eyewear |
| US9658473B2 (en) | 2005-10-07 | 2017-05-23 | Percept Technologies Inc | Enhanced optical and perceptual digital eyewear |
| BRPI0818693A8 (pt) | 2007-10-05 | 2018-08-14 | Essilor Int | Método para proporcionar uma lente oftálmica para óculos por calcular ou selecionar um desenho |
| FR2936879B1 (fr) * | 2008-10-07 | 2011-03-11 | Essilor Int | Verre ophtalmique corrigeant la vision foveale et la vision peripherique. |
| EP2370851A1 (fr) * | 2008-12-26 | 2011-10-05 | Essilor International (Compagnie Générale D'Optique) | Procédé destiné à améliorer une lentille ophtalmique de lunette par calcul ou sélection d'un design |
| WO2011058177A1 (fr) | 2009-11-13 | 2011-05-19 | Essilor International (Compagnie Generale D'optique) | Procédé pour produire une lentille ophtalmologique pour lunettes par calcul ou sélection d'une configuration |
| EP2695578B1 (fr) | 2012-08-07 | 2015-09-16 | Essilor Canada Ltee | Procédé permettant de déterminer les mouvements de tête et des yeux d'un individu |
| US11181740B1 (en) | 2013-03-15 | 2021-11-23 | Percept Technologies Inc | Digital eyewear procedures related to dry eyes |
| WO2015150030A1 (fr) * | 2014-04-01 | 2015-10-08 | Essilor International (Compagnie Generale D'optique) | Systèmes et procédés de réalité augmentée |
| CN104434026B (zh) * | 2014-12-17 | 2016-08-17 | 深圳市斯尔顿科技有限公司 | 视网膜注视点偏离黄斑中心凹的检测方法 |
| WO2017157760A1 (fr) * | 2016-03-15 | 2017-09-21 | Essilor International (Compagnie Générale d'Optique) | Procédé de détermination d'une lentille ophtalmique adaptée à un paramètre de locomotion |
| BR112019022070A2 (pt) | 2017-05-12 | 2020-05-05 | Essilor Int | método para determinação de uma potência de visão de perto específica de uma lente oftálmica |
| EP3461394A1 (fr) | 2017-10-02 | 2019-04-03 | Essilor International | Procédé et système permettant d'adapter le comportement visuel et/ou visuel-moteur d'une personne |
| US11378818B2 (en) | 2018-03-01 | 2022-07-05 | Essilor International | Lens element |
| JP7466450B2 (ja) | 2018-03-01 | 2024-04-12 | エシロール・アンテルナシオナル | レンズ要素 |
| EP3547013A1 (fr) * | 2018-03-30 | 2019-10-02 | Essilor International (Compagnie Generale D'optique) | Procédé pour déterminer une lentille ophtalmique à vision unique |
| EP3736617A1 (fr) * | 2019-05-10 | 2020-11-11 | Carl Zeiss Vision International GmbH | Procédé de fabrication d'un moyen de correction optique |
| EP3990974A1 (fr) | 2019-06-26 | 2022-05-04 | Essilor International | Zone de liberté de tête d'une lentille optique |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001062139A1 (fr) * | 2000-02-25 | 2001-08-30 | Sola International Holdings Ltd | Procede et systeme de prescription et/ou preparation de lentilles ophtalmiques |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL143503A0 (en) * | 2001-05-31 | 2002-04-21 | Visionix Ltd | Aberration correction spectacle lens |
| US7090348B2 (en) * | 2003-10-28 | 2006-08-15 | Essilor International (Compagnie Generale D'optique) | Method for designing spectacle lenses taking into account an individual's head and eye movement |
| CN1909860B (zh) * | 2003-11-19 | 2012-03-21 | 视力Crc有限公司 | 用于改变相对场曲和外围离轴焦点位置的方法和设备 |
| FR2863857B1 (fr) * | 2003-12-23 | 2006-10-13 | Essilor Int | Mesure du comportement d'un porteur de lentilles ophtalmologiques |
| US7029116B2 (en) * | 2004-03-22 | 2006-04-18 | Giuseppe Roscini | Innovative minus power lens and processing methods thereof |
| EP1585217B1 (fr) * | 2004-04-08 | 2007-09-19 | STMicroelectronics N.V. | Procédé de contrôle de la puissance du signal de sortie d'un système amplificateur, et système associé |
| FR2880428B1 (fr) * | 2005-01-04 | 2007-10-26 | Essilor Int | Verre ophtalmique progressif et procede de fabrication d'un tel verre |
| FR2891375B1 (fr) * | 2005-09-29 | 2008-02-15 | Essilor Int | Lentille ophtalmique polarisante adaptee au comportement oeil/tete d'un porteur. |
| US7862171B2 (en) * | 2005-10-12 | 2011-01-04 | Carl Zeiss Vision Australia Holdings Limited | Ophthalmic lens element for myopia correction |
-
2007
- 2007-02-15 FR FR0701110A patent/FR2912820B1/fr active Active
-
2008
- 2008-02-12 EP EP08762062A patent/EP2118703A1/fr not_active Withdrawn
- 2008-02-12 US US12/526,112 patent/US8079705B2/en active Active
- 2008-02-12 CN CN2008800050179A patent/CN101663609B/zh active Active
- 2008-02-12 WO PCT/FR2008/050210 patent/WO2008104695A1/fr not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001062139A1 (fr) * | 2000-02-25 | 2001-08-30 | Sola International Holdings Ltd | Procede et systeme de prescription et/ou preparation de lentilles ophtalmiques |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2912820B1 (fr) | 2009-05-15 |
| FR2912820A1 (fr) | 2008-08-22 |
| CN101663609A (zh) | 2010-03-03 |
| CN101663609B (zh) | 2012-03-28 |
| US8079705B2 (en) | 2011-12-20 |
| US20100002191A1 (en) | 2010-01-07 |
| WO2008104695A1 (fr) | 2008-09-04 |
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