CN116236701A - Optical path system for myopia prevention and control - Google Patents

Abstract

The embodiment of the application provides an optical path system for myopia prevention and control, which comprises: the device comprises a laser source, a light homogenizing plate and an illumination projection system, wherein the light homogenizing plate and the illumination projection system are arranged in a light transmission channel of the light path system, and the laser source is arranged at the inlet end of the light transmission channel; the light homogenizing plate is attached to the light output end of the laser source so as to scatter light emitted by the laser source; the illumination projection system is arranged on one side, far away from the laser source, of the light homogenizing plate, and is arranged at intervals with the light homogenizing plate so as to collect scattered light rays emitted by the light homogenizing plate and project the scattered light rays to pupils of a user. According to the embodiment of the application, the fundus uniform surface illumination distribution can be realized, so that the eye can see the visual effect of the large-diameter uniform surface light spot in the light feeding process, the visual stimulus to the eye is reduced, the red light irradiation intensity of the peripheral macular area is improved, the uniform light feeding treatment is realized, and the effect of inhibiting the growth of the eye axis is improved.

Description

An optical path system for myopia prevention and control

technical field

The present application relates to the technical field of vision prevention and control devices, in particular to an optical path system for myopia prevention and control.

Background technique

Eye axis growth is one of the main factors causing myopia, especially for adolescents in the rapid growth period. Therefore, the use of red light to illuminate the retina has a positive impact on the prevention and control of myopia in adolescents. Studies have shown that directly irradiating the retina with 650nm long-wave red light can effectively inhibit the growth of the axial length of the eye. Its working principle is: the penetrability of this waveband is strong, so the red light acts on the choroid at the same time after penetrating the retina. Because the 650nm red light has a warming effect, it will open the bottleneck-like stenosis at the opening of the small artery of the choroid leaflet, increasing The blood flow into the lobules increases the microcirculatory blood volume, thickens the choroid, and prevents hypoxia in the sclera, so it can restore the thinned choroid to its normal thickness, provide sufficient oxygen for the sclera, and improve the blood circulation of the fundus , so that myopia will no longer deepen. Secondly, the 650nm red light can make the retinal epithelial pigment cells secrete dopamine, which can effectively inhibit the excessive growth of the eye axis.

At present, light-feeding therapy equipment usually adopts a binocular structure, each of which corresponds to one eye, and the distance between the binoculars can be adjusted to fit the human eye through a mechanical structure, so that the red light images seen by both eyes overlap. Among them, the basic optical path of the monocular can be as follows: the light of red wavelength exits from the light source, enters the human eye after passing through the light-transmitting element, and irradiates on the retina.

The red light source adopted by the above-mentioned light-feeding therapy equipment, no matter the light-emitting LED or the laser diode, is an approximate fixation light source, and its light-emitting area is small. The central fovea will be adjusted to face the light source itself, and a circular spot with higher brightness in the center will be seen. When the human eye adjusts the photopic position to make the light source image clearer, the size of the central bright spot will decrease, and the brightness of the bright spot will further increase, and the increase in visual stimulation will cause discomfort to the human eye. Moreover, in addition to the small size of the light source causing strong visual stimulation caused by looking directly at the light source, this solution also has a negative impact. When the red light energy is more concentrated in the center of the macular area, the red light energy in the surrounding macular area is very weak, resulting in uneven illumination and stimulation of the choroid in the macular area, which in turn leads to uneven heating and stimulation of the choroid. Affect the actual effect of red light irradiation on inhibiting eye axis growth.

Contents of the invention

The embodiment of the present application provides an optical path system for prevention and control of myopia, so as to solve the problems caused by the concentration of red light energy in the light-feeding therapy equipment in the prior art, which causes discomfort in visual stimulation and uneven light-feeding, which affects red light irradiation and inhibits the growth of the eye axis. question of actual effect.

In order to solve the above technical problems, an embodiment of the present application provides an optical path system for myopia prevention and control, including: a laser source, a uniform light plate, and an illumination projection system, wherein,

The uniform light plate and the lighting projection system are arranged in the light transmission channel of the optical path system, and the laser source is arranged at the entrance end of the light transmission channel;

The homogenizing plate is attached to the light output end of the laser source to scatter the light emitted by the laser source;

The lighting projection system is arranged on the side of the dodging plate away from the laser source, and is spaced apart from the dodging plate to collect scattered light emitted by the dodging plate and project the scattered light to the pupil of the user .

Optionally, the illumination projection system includes: an illumination lens and a projection lens,

The illumination lens is arranged on the side of the dodging plate away from the laser source, and is spaced apart from the dodging plate to collect the scattered light and project the scattered light to the projection lens;

The projection lens is spaced apart from the illumination lens to project the scattered light to the user's pupil.

Optionally, an exit pupil surface is attached to the side of the illumination lens away from the uniform plate, so that the energy of the light spot projected on the exit pupil surface can be evenly distributed.

Optionally, the light homogenizing plate is located on the front focal plane of the illumination lens, so that the scattered light irradiates uniformly on the exit pupil plane.

Optionally,

The pupil exit plane is located at the front focal plane of the projection lens, so that the scattered light is evenly projected to the position of the pupil of the user.

Optionally,

The pupil of the user is located at the back focal plane of the projection lens, so that the light emitted from various positions on the exit pupil surface is irradiated to the fundus of the user through the pupil.

Optionally, the system further includes: a structured light forming structure,

The structured light forming structure is arranged in the light transmission channel, between the illumination lens and the projection lens, and the position of the structured light forming structure coincides with the exit pupil surface, so as to collect the illumination The scattered light projected by the lens blocks the light projected to the fovea of the user's fundus in a set blocking manner to form a set pattern;

The projection lens projects the pattern formed by the structured light forming structure to the pupil of the user, and forms a red light irradiation area with a set pattern on the fundus of the user through human eyes.

Optionally, the structured light forming structure shields the uniform energy distribution on the exit pupil surface in a transmission shielding manner or a reflection shielding manner to form the set pattern.

Optionally, the structured light forming structure is a transparent plate, and the pattern of the shaded part of the structured light required by the application is set on the transparent plate, so that the uniform light spot on the exit pupil surface passes through the transparent plate The pattern information of the structured light is attached to the spot,

The central area of the transparent plate is an opaque area, and projects the scattered light emitted from the exit pupil surface to the pupil of the user through the projection lens in a transmission blocking manner.

Optionally, the structured light forming structure is a mirror, and the central area of the mirror is a hollow structure,

The light transmission channel is a folded channel, the scattered light emitted by the illumination lens is projected onto the reflector, the scattered light is reflected to the projection lens by the reflector, and passes through the projection lens The scattered rays are projected to the pupil of the user.

Optionally, the system further includes: a fixation light source,

The fixation light source is arranged on the side of the reflector away from the projection lens, and the light emitted by the fixation light source is projected to the projection lens through the hollow structure of the reflector.

Optionally, the uniform light plate is made of materials with light scattering properties.

The optical path system for the prevention and control of myopia provided by the embodiment of the present application is provided with a uniform light plate and an illumination projection system in the light transmission channel. After the light plate, the collimation of the laser light is removed, the red light is scattered and propagated backwards, and the scattered light is projected to the pupil of the user through the lighting projection system, which can achieve a uniform surface lighting distribution of the fundus, so that the eyes can see during the light feeding process The visual effect of the large-diameter uniform surface spot can reduce the visual stimulation to the human eye and increase the intensity of red light irradiation in the surrounding macular area, so as to realize uniform photofeeding therapy and improve the effect of inhibiting the growth of the eye axis.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present application. Obviously, the accompanying drawings in the following description are only some embodiments of the present application , for those skilled in the art, other drawings can also be obtained according to these drawings on the premise of not paying creative work.

FIG. 1 is a schematic structural diagram of an optical path system for myopia prevention and control provided in an embodiment of the present application;

FIG. 2 is a schematic structural diagram of another optical path system for myopia prevention and control provided by the embodiment of the present application;

FIG. 3 is a schematic structural diagram of another optical path system for preventing and controlling myopia provided by an embodiment of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

Referring to FIG. 1 , it shows a schematic structural diagram of an optical system for preventing and controlling myopia provided by an embodiment of the present application. As shown in Figure 1, the optical path system for the prevention and control of myopia can include: a laser source 11, a uniform light plate 12 and an illumination projection system (13 and 14), wherein,

The uniform light plate 12 and the lighting projection system (composed of 13 and 14 together) can be arranged in the light transmission channel of the optical path system.

The laser source 11 can be arranged at the entrance end of the light transmission channel. In this example, the laser source 11 can emit 650nm red light. Since 650nm red light has a warming effect, it will open the bottleneck-like stenosis at the opening of the arteriole of the choroidal leaflet, increase the blood flow into the leaflet, and make the microcirculation The blood volume increases, the thickness of the choroid increases, and the sclera is not hypoxic, so the thinned choroid can return to its normal thickness, provide sufficient oxygen for the sclera, and improve the blood circulation of the fundus, so that the degree of myopia will not deepen. Of course, it is not limited thereto. In a specific implementation, the laser source 11 can also emit red light of other wavelengths. Specifically, the wavelength value of the red light emitted by the laser source 11 can be determined according to business requirements, which is not discussed in this embodiment. be restricted.

The homogenizing plate 12 is attached to the light output end of the laser source 11 to scatter the light emitted by the laser source 11 . In this example, the light uniform plate 12 may be made of a material with light scattering properties, for example, the light uniform plate 12 may be made of frosted glass and other materials with light scattering properties.

In a specific implementation, the dodging plate 12 can be placed close to the laser source 11 . Wherein, the homogenizing plate 12 can be frosted glass or other materials that can scatter light to light. The purpose of this setting is to make the red light strike the homogenizing plate 12, remove the collimation of the laser light, and make the red light scatter and propagate backward. . At this time, the light source can be equivalent to a divergent surface light source after passing through the uniform plate 12. The size of the surface light source is the size of the light spot that the laser source 11 strikes on the uniform plate 12, and its divergence angle is equal to the light scattering angle of the uniform plate 12.

The lighting projection system (13 and 14) can be arranged on the side of the dodging plate 12 away from the laser source 11, and spaced apart from the dodging plate 12, so as to collect the scattered light emitted by the dodging plate 12 and project the scattered light to the pupil 17 of the user.

In the embodiment of the present application, by adding a uniform light plate and an illumination projection system to the optical path system for myopia prevention and control, the laser beam can be hit behind the light uniform plate, the collimation of the laser light can be removed, and the red light can be scattered and propagated backwards. Through the lighting projection system, the scattered light is projected to the user's pupil, which can realize the uniform surface illumination distribution of the fundus, so that the eye can see the visual effect of a large-diameter uniform surface spot during the light feeding process, so as to reduce the visual stimulation of the human eye and Increase the intensity of red light irradiation in the peripheral macular area, realize uniform photofeeding therapy, and improve the effect of inhibiting eye axis growth.

Next, the structure of the optical path system provided by the embodiment of the present application is described in detail in conjunction with specific implementation manners.

In a specific implementation manner of the present application, the illumination projection system may include: an illumination lens 13 and a projection lens 14 (as shown in FIG. 1 ).

In this example, a lens is an optical element made of a transparent substance whose surface is part of a sphere. "Illumination" and "projection" are functional descriptions, and their specific implementation can be a lens or a lens group composed of multiple lenses. Illumination lens and projection lens can form the system structure of Kohler illumination.

The illuminating lens 13 can be arranged on the side of the dodging plate 12 away from the laser source 11 and spaced apart from the dodging plate 12 to collect scattered light emitted by the dodging plate 12 and project the scattered light to the projection lens 14 .

The projection lens 14 can be spaced apart from the illumination lens 13 to project the scattered light emitted by the illumination lens 13 to the user's pupil 17 .

In this embodiment, the illumination lens 13 and the projection lens 14 may be made of the same material, or may be made of different materials. When the illumination lens 13 and the projection lens 14 are made of the same material, parameters such as the transparency of the material used for the illumination lens 13 and the projection lens 14 may be the same or different. Specifically, the preparation materials and material parameters of the illumination lens 13 and the projection lens 14 may be determined according to business requirements, which is not limited in this embodiment.

In a specific implementation of the present application, an exit pupil surface 15 is attached to the side of the illuminating lens 13 away from the uniform plate 12 , so that the light spot energy projected onto the exit pupil surface 15 can be evenly distributed.

In an optical system, the image formed by the aperture stop in the image space of the optical system is called the "exit pupil" of the system. The position of the exit pupil (represented by the exit pupil distance) and diameter (represented by the exit pupil diameter) represent the position and aperture of the exiting beam. In this example, the mechanically structured aperture stop that is closely attached to the back of the illumination lens 13 is the exit pupil surface 15 .

In another specific implementation manner of the present application, the uniform light plate 12 may be located on the front focal plane of the illumination lens 13 , so that the scattered light irradiates on the exit pupil surface 15 uniformly. That is to say, the illuminating lens 13 can make the scattered light emitted by the homogenizing plate 12 pass through the illuminating lens 13 and uniformly irradiate the exit pupil surface 15 thereof.

In another specific implementation manner of the present application, the exit pupil surface 15 may be located at the front focal plane of the projection lens 14 , so that scattered light is evenly projected to the fundus 16 of the user. That is, by placing the exit pupil surface 15 of the illumination lens 13 at the front focal plane of the projection lens 14, the projection lens 14 and the human eye can be formed into a projection lens group, and the light spot distribution on the exit pupil surface 15 is projected onto the user's fundus 16, so that The human eye sees a uniform surface light source.

In another specific implementation of the present application, the user's pupil 17 is located at the rear focal plane of the projection lens 14 , so that the light emitted from various positions on the pupil exit surface 15 is irradiated to the user's fundus 16 through the user's pupil 17 .

In this embodiment, the exit pupil surface 15 of the illuminating lens 13 is optically conjugate to the fundus of the human eye, so that the surface light source distribution actually seen by the human eye is the image of the spot distribution on the exit pupil surface, and according to the focal length of the projection lens 14 into a certain magnification ratio. Since the exit pupil surface 15 is optically conjugated to the user's fundus 16, the circular light spot actually observed by the human eye will have a missing central part, thereby avoiding visual stimulation to the fovea.

The spot-object-image relationship in the above system is as follows: Assuming that the focal length of the illumination lens is f1 and the diameter is D1, then the limit scattering half-angle θ1 that the illumination lens can receive from the homogenizing plate is: tanθ1=D1/(2*f1). The limiting diameter of the exit pupil surface of the illumination lens is the same as the diameter of the illumination lens. The divergence half-angle θ1` of the exit pupil surface is related to the size d of the laser tube on the uniform plate: tanθ1`=d/(2*f1). Assuming that the focal length of the projection lens is f2 and the diameter is D2, the diameter D _pupil of the spot at the pupil is: D _pupil = 2*f2*tanθ1`=f2/f1, which is the focal length ratio of the projection lens and the illumination lens. The divergence half-angle θ _pupil of the light spot at the pupil of the human eye is: tanθ _pupil =D1/(2*f2). Assuming that the focal length of the human eye is f3, the actual size of the light source D _fundus seen by the human eye fundus is: D _fundus = 2*f3*tanθ _pupil = f3/f2, which is the ratio of the focal length of the human eye to the focal length of the projection lens. Typically, the focal length of the human eye is 17mm.

In another specific implementation of the present application, the optical path system may further include: a structured light forming structure, which may be arranged in the light transmission channel, between the illumination lens 13 and the projection lens 14, and the structured light The forming structure coincides with the position of the exit pupil surface 15 to collect the scattered light projected by the illumination lens 13 and block the light projected to the fovea of the user's fundus 16 in a set blocking manner to form a set pattern. In this example, the set pattern may be a pattern in a shape such as a circular pattern, and the specific shape of the set pattern may be determined according to business requirements, which is not limited in this embodiment.

The projection lens 14 can project the pattern formed by the structured light forming structure to the pupil 17 of the user, and form a red light irradiation area with a set pattern on the fundus 16 of the user through human eyes.

In a specific implementation of the present application, the structured light forming structure can shield the uniform energy distribution on the exit pupil surface 15 in a transmission shielding manner or a reflection shielding manner to form a set pattern.

The embodiment of the present application provides two structured light forming structures. Next, the two structured light forming structures provided in the embodiment of the present application are described in detail below with reference to FIG. 2 and FIG. 3 .

Form a structure for the first structured light:

Referring to FIG. 2 , it shows a schematic structural diagram of another optical system for preventing and controlling myopia provided by the embodiment of the present application.

In this embodiment, the structured light forming structure may be a transparent plate. As shown in FIG. 2 , the optical path system may include: a laser source 21 , a uniform plate 22 , an illumination lens 23 , a projection lens 24 , a pupil exit surface 25 and a transparent plate 26 . The transparent plate 26 is provided with the pattern of the light-shielding part of the structured light required by the application, and the pattern of the light-shielding part is made of black light-absorbing material or light-reflecting material, so that the uniform light spot on the exit pupil surface 25 passes through the transparent plate 26. Additional pattern information for structured light. In this example, the pattern of the shading part can be set on the transparent plate 26 by printing, or can be set on the transparent plate 26 in other ways. Specifically, it can be determined according to business requirements, which is not discussed in this embodiment. be restricted.

The central area of the transparent plate 26 is an opaque area. The transparent plate 26 can project the scattered light emitted from the exit pupil surface 25 to the pupil 27 of the user through the projection lens 24 in a transmission blocking manner. In this example, the area of the opaque region is smaller than the area of the exit pupil surface 25 .

The opaque area can be a black area, the opaque area can be a circular area, or an area of other shapes, etc. Specifically, the shape of the opaque area can be determined according to business requirements. In this embodiment There is no restriction on this.

In the embodiment of the present application, a transparent plate 26 is provided, and the light-proof area in the central area of the transparent plate 26 blocks the light at the center of the exit pupil surface 25 from entering the subsequent system. Since the exit pupil surface 25 is optically conjugated to the fundus of the human eye, the circular light spot actually observed by the human eye will have a missing central part, thereby avoiding visual stimulation to the fovea.

Form a structure for the second structured light:

Referring to FIG. 3 , it shows a schematic structural diagram of another optical system for preventing and controlling myopia provided by the embodiment of the present application.

The structured light forming structure provided in this embodiment can be a reflector, as shown in Figure 3, the optical path system for the prevention and control of myopia can include: a laser source 31, a uniform light plate 32, an illumination lens 33, a projection lens 34 and a reflector 35.

As shown in FIG. 3 , the structured light forming structure may be a reflector 35 , and the central area of the reflector 35 is a hollow structure.

In this example, the light transmission channel is a folded channel. As shown in FIG. The lens 34 projects scattered light rays to the user's pupil 37 .

The reflector 35 can fold the optical axis of the optical element in front of it, so that the laser tube 31 and the uniform light plate 32 are located at the side of the optical path system. Wherein, the reflector 35 may be a plane reflector, and there may be a circular hole (not limited to circular) in the central area. After the red light exits from the illuminating lens 33, it enters the projection lens 34 through the emission of the hollow reflector 35. Since there is a hole in the middle of the reflector 35, the light in the middle part cannot be reflected by the reflector 35 and continue to emit downwards from the hole, so it can The light that realizes the ring distribution enters the human eye. At the same time, visual stimulation to the fovea of the fundus 36 of the user can be avoided.

In another specific implementation of the present application, the light feeding device may further include: a fixation light source 38. In this example, the fixation light source 38 may be a light source of a different color than red light such as an LED lamp.

The fixation light source 38 may be disposed on a side of the reflector 35 away from the projection lens 34 , and the light emitted by the fixation light source 38 may be projected to the projection lens 34 through the hollow structure of the reflector 35 .

In the embodiment of the present application, by adding a fixation light source, the user can be guided to look at the center of the circular distribution, and the red light irradiation can inhibit the growth of the eye axis.

The optical path system for myopia prevention and control provided in the embodiment of the present application includes: a laser source, a dodging plate and a lighting projection system, wherein the dodging plate and the lighting projection system are arranged in the light transmission channel of the optical path system, and the laser source is set in the At the entrance end of the light transmission channel, the homogeneous plate is attached to the light output end of the laser source to scatter the light emitted by the laser source. The lighting projection system is arranged on the side of the dodging plate away from the laser source, and is spaced apart from the dodging plate to collect scattered light emitted by the dodging plate and project the scattered light to the pupil of the user. In the embodiment of the present application, a uniform light plate and an illumination projection system are arranged in the light transmission channel. The light uniform plate is attached to the light output end of the laser source, so that the laser beam hits the light uniform plate, and the collimation of the laser light is removed, so that The red light is scattered and propagated backwards, and the scattered light is projected to the pupil of the user through the lighting projection system, which can achieve a uniform surface illumination distribution of the fundus, so that the eye can see the visual effect of a large-diameter uniform surface spot during the light-feeding process. Reduce the visual stimulation to the human eye and increase the intensity of red light irradiation in the peripheral macular area to achieve uniform photofeeding therapy and improve the effect of inhibiting the growth of the eye axis.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or apparatus comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus comprising that element.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (12)

1. An optical path system for myopia prevention and control, characterized in that it comprises: a laser source, a uniform light plate and an illumination projection system, wherein, The uniform light plate and the lighting projection system are arranged in the light transmission channel of the optical path system, and the laser source is arranged at the entrance end of the light transmission channel; The homogenizing plate is attached to the light output end of the laser source to scatter the light emitted by the laser source; The lighting projection system is arranged on the side of the dodging plate away from the laser source, and is spaced apart from the dodging plate to collect scattered light emitted by the dodging plate and project the scattered light to the pupil of the user . 2. The system according to claim 1, wherein the illumination projection system comprises: an illumination lens and a projection lens, The illumination lens is arranged on the side of the dodging plate away from the laser source, and is spaced apart from the dodging plate to collect the scattered light and project the scattered light to the projection lens; The projection lens is spaced apart from the illumination lens to project the scattered light to the user's pupil. 3. The system according to claim 2, characterized in that an exit pupil surface is attached to the side of the illumination lens away from the uniform plate, so that the energy of the light spot projected on the exit pupil surface can be evenly distributed . 4. The system according to claim 3, wherein the uniform light plate is located on the front focal plane of the illumination lens, so that the scattered light irradiates uniformly on the exit pupil plane. 5. The system of claim 3, wherein: The pupil exit plane is located at the front focal plane of the projection lens, so that the scattered light is evenly projected to the position of the pupil of the user. 6. The system of claim 3, wherein: The pupil of the user is located at the back focal plane of the projection lens, so that the light emitted from various positions on the exit pupil surface is irradiated to the fundus of the user through the pupil. 7. The system according to claim 3, further comprising: a structured light forming structure, The structured light forming structure is arranged in the light transmission channel, between the illumination lens and the projection lens, and the position of the structured light forming structure coincides with the exit pupil surface, so as to collect the illumination The scattered light projected by the lens blocks the light projected to the fovea of the user's fundus in a set blocking manner to form a set pattern; The projection lens projects the pattern formed by the structured light forming structure to the pupil of the user, and forms a red light irradiation area with a set pattern on the fundus of the user through human eyes. 8 . The system according to claim 7 , wherein the structured light forming structure blocks the uniform energy distribution on the exit pupil surface in a transmission blocking manner or a reflection blocking manner to form the set pattern. 9. The system according to claim 8, wherein the structured light forming structure is a transparent plate, and the transparent plate is provided with a pattern of a light-shielding part of the structured light required for the application, so that the exit pupil After the uniform light spot on the surface passes through the transparent plate, the pattern information of the structured light is added to the light spot, The central area of the transparent plate is an opaque area, and projects the scattered light emitted from the exit pupil surface to the pupil of the user through the projection lens in a transmission blocking manner. 10. The system according to claim 8, wherein the structured light forming structure is a mirror, and the central area of the mirror is a hollow structure, The light transmission channel is a folded channel, the scattered light emitted by the illumination lens is projected onto the reflector, the scattered light is reflected to the projection lens by the reflector, and passes through the projection lens The scattered rays are projected to the pupil of the user. 11. The system according to claim 10, further comprising: a fixation light source, The fixation light source is arranged on the side of the reflector away from the projection lens, and the light emitted by the fixation light source is projected to the projection lens through the hollow structure of the reflector. 12. The system according to claim 1, wherein the uniform light plate is made of a material with light scattering properties.

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