A kind of eyeglass lens

Abstract

The invention belongs to the technical field of myopia correction glasses, and specifically is a spectacle lens; the spectacle lens comprises a base lens, on which a central optical zone and a peripheral optical zone are arranged; the peripheral optical zone comprises a nasal weak defocus zone, a temporal strong defocus zone, an upper zone for distance use and a soothing and adjusting zone for intermediate and near use; the nasal weak defocus zone and the temporal strong defocus zone are respectively located on the left and right sides of the central optical zone and are horizontally arranged; the upper zone for distance use and the soothing and adjusting zone for intermediate and near use are respectively located on the upper and lower sides of the central optical zone, and are respectively located between the nasal weak defocus zone and the temporal strong defocus zone and are vertically distributed; the invention can realize that when looking far away, the central optical zone is imaged on the retina, and the paracenter is imaged on the retina or in front of the retina, and can also take into account the phenomenon of inward rotation of the eyeball when looking at intermediate and near distances, and add a positive defocus amount in the lower area of ​​the spectacle lens to drive the eye to relax the ciliary muscle, so as to form a peripheral non-defocus state or a myopic defocus state in the whole visual range.

Description

Technical Field

[0001] The invention belongs to the technical field of myopia correction glasses, in particular to a spectacle lens. Background Art

[0002] Clinical studies have shown that myopic children will have an increased amount of hyperopic defocus on the peripheral retina after wearing single-vision glasses. Designing glasses that match the refractive state of the human eye, including the central retina and the peripheral retina, has become a new way to control the progression of myopia. The theory of reducing peripheral retinal defocus for myopia control, its optical model mainly refers to the fact that when looking far away (incident light from 5 meters away), while the on-axis light is imaged on the retina, the off-axis light can also be imaged on or in front of the retina (such as Figure 1 ), at the same time, the literature also shows that the peripheral refractive state is symmetrical in the corresponding parts of the left and right eyes, but the hyperopic defocus on the temporal side is significantly greater than that on the nasal side; that is, the temporal and nasal retinal peripheries of myopic eyes show hyperopic defocus, but the refractive power of the temporal retinal periphery is larger than that of the nasal retinal periphery, showing an asymmetric phenomenon;

[0003] The study also confirmed that the upper and lower retinal peripheries of myopic patients are myopic defocus. For myopic patients, myopic defocus of the retinal periphery will not accelerate the growth of the eye axis and does not need to be corrected.

[0004] In addition to eliminating the hyperopic defocus of the peripheral retina to slow down the growth of the eye axis, vision correction also needs to consider comfort when looking at close objects. The human eye imaging system is similar to a zoom camera, which can autonomously adjust the refractive state of the human eye to adapt to different gaze distances. For normal people, whether the object is near or far, the image of the object can be seen clearly on the retina. This is mainly because the curvature of the lens can be adjusted by the contraction and relaxation of the ciliary body. When looking at objects from far to near, the ciliary body contracts and the curvature of the lens becomes larger. In addition, when looking at nearby objects clearly, the eyes must not only adjust, but also the visual axes of both eyes must be turned to the object being looked at. That is, both eyes turn inward, so that the images of both eyes can fall on the fovea of ​​the retina, and then merge into one through the visual center to form binocular single vision. In other words, when looking at close objects, the three phenomena of accommodation, convergence and pupil reduction will occur simultaneously; the relative residual accommodation amount when accommodation exceeds the convergence effect is called positive reserve accommodation, which means that when looking at close objects, the more residual accommodation amount, the more comfortable it is, and the less likely it is to have visual fatigue. This is why wearing a pair of aging glasses (positive glasses) when looking at close objects helps relax the ciliary muscles; at the same time, the larger the inward rotation angle, the closer the gaze distance is, and the ciliary muscles of the human eye are also when the adjustment curvature is the largest (such as Figure 2 );

[0005] However, the existing defocus lens design has the following shortcomings:

[0006] (1) Most of them are designed with a single defocus within the 360° peripheral range, without considering the actual situation that the temporal and nasal sides of the retina are asymmetric defocus;

[0007] (2) The single defocus design does not take into account the fact that when looking at close objects, the angle of inward rotation of the eyes increases as the gaze distance gets closer, and the adjustment of the ciliary muscles becomes more tense. The defocus amount corresponding to different inward rotation angles is set in the lower area to relax the adjustment to the greatest extent.

[0008] (3) Currently, all defocus designs on the market only choose one defocus method, either point, ring or progressive. However, wearers have individual differences in their sensitivity to defocus in different lens areas. It is necessary to combine their own sensitivity and choose appropriate peripheral defocus design based on different areas, so as to ensure functionality and have better visual effects.

[0009] Therefore, the present application proposes a spectacle lens. Summary of the invention

[0010] In order to solve the technical problems existing in the background technology, the present invention provides a spectacle lens.

[0011] The present invention is implemented by the following technical scheme: a spectacle lens, the spectacle lens comprises a substrate, a central optical zone and a peripheral optical zone are provided on the substrate, and the peripheral optical zone is defocused by a defocusing module;

[0012] The peripheral optical zone includes a nasal weak defocus zone, a temporal strong defocus zone, an upper zone for distance use, and a soothing adjustment zone for near and intermediate use;

[0013] The nasal side weak defocus area and the temporal side strong defocus area are respectively located on the left and right sides of the central optical area and are arranged horizontally;

[0014] The upper zone for far vision and the soothing adjustment zone for near and intermediate vision are respectively located at the upper and lower sides of the central optical zone, and are respectively located between the nasal weak defocus zone and the temporal strong defocus zone and are distributed vertically.

[0015] Preferably, the defocus module adopts point defocus or ring defocus;

[0016] The diopter of the point-shaped or ring-shaped defocused area is:

[0017] (1-1)

[0018] In formula (1-1) is the diopter of the central optical zone, and D is the defocus amount;

[0019] The relationship between the radius of curvature of the point-shaped or annular defocused area in the spectacle lens and the radius of curvature of the central optical area is:

[0020] (1-2)

[0021] In formula (1-2), D is the defocus amount, n is the refractive index of the lens material, and d is the center thickness of the lens. is the radius of curvature of the lens defocus area, is the radius of curvature of the central optical zone of the lens, is the radius of curvature of the surface corresponding to the central optical zone.

[0022] Preferably, the defocus module also adopts gradual defocus;

[0023] The diopter of each point in the gradual defocus area is:

[0024] (1-3)

[0025] In formula (1-3), is the diopter of the central optical zone, The distance from the center is The defocus amount at The distance from the center is The defocus amount at is the distance from a point in the gradient area to the center;

[0026] The average defocus amount in the gradual defocus area is:

[0027] (1-4)

[0028] The surface height in the gradual defocusing area is:

[0029] (1-5)

[0030] In formula (1-5), r is the position radius of the lens, c is the curvature at the vertex of the surface, k is the cone coefficient of the quadratic surface, and z is the surface vector height at position r.

[0031] Preferably, the spectacle lens is suitable for frame glasses or contact lenses, and the central optical zone is circular or elliptical.

[0032] Preferably, the diameter of the central optical zone suitable for frame glasses is in the range of 8-20 mm; the diameter of the central optical zone suitable for contact lenses is in the range of 3-7 mm.

[0033] Preferably, the average defocus range of the nasal weak defocus area and the temporal strong defocus area is 0.50 to 5.0D, the nasal weak defocus area has an area range of -45° to +45°, and the temporal strong defocus area has an area range of +135° to -135°.

[0034] Preferably, the upper zone for far vision has a range of +45° to +135°, and the soothing adjustment zone for near vision has a range of -135° to -45°.

[0035] Preferably, the intermediate and near soothing accommodation zone has an additional positive relative refractive power.

[0036] The beneficial effects of the present invention are:

[0037] 1. The present invention can achieve the following requirements: when looking far away, the on-axis incident light is imaged on the central retina, and the off-axis incident light is imaged on or in front of the peripheral retina. At the same time, when looking at medium and near distances, combined with the phenomenon of inward rotation of the eyeball, a positive defocus amount is added to the lower area of ​​the eye lens to drive the eye to relax the ciliary muscle, thereby forming a peripheral defocus-free or myopic defocus state in the entire visual range.

[0038] 2. The present invention can fully correct the myopia of patients in the central optical zone. At the same time, according to the actual defocus situation of the human eye, a weak defocus area on the nasal side and a strong defocus area on the temporal side are set, and different defocus amounts are adopted, which can effectively eliminate the hyperopic defocus of each area and avoid the visual discomfort caused by the symmetrical defocus design to the patients. In addition, since the positive lens produces negative spherical aberration and the negative lens produces positive spherical aberration, the myopic patients wear negative lenses. However, the spherical aberration changes at different rates with the changes in the pupil diameter and the myopia degree. The defocus change rate is controlled by the aspherical surface of the upper area for distance use, and the problem of indirect hyperopic defocus caused by the residual spherical aberration in the spherical design is compensated, so that the light passing through the upper area can still maintain the original myopic defocus distribution after being focused on the peripheral retina.

[0039] 3. The four subareas of the peripheral optical zone of the present invention can select a suitable peripheral defocus technology combination or use them alone. The point-shaped or ring-shaped raised or depressed areas are the defocus areas, and the refractive power of the remaining areas is the same as that of the central optical zone. These two defocusing methods improve the discomfort caused by the defocus design of the peripheral optical zone by retaining the refractive power of part of the central optical zone; the geometric surface shape of the gradual defocus has no obvious raised or depressed fluctuations, and the curvature radius of each part of the area is continuously changing. This defocusing method with different points is suitable for people who have a strong adaptability to the defocus design of the peripheral optical zone. Through the selection of the defocusing method, the compliance of wearing glasses is improved to a greater extent, thereby playing the role of delaying the growth of the eye axis brought by peripheral myopia or no defocus design. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 Schematic diagram of the central ray forming an image on the retina and the paracentral ray forming an image in front of the retina;

[0041] Figure 2 Schematic diagram of the increase in the inward rotation angle of the eyes with the gaze distance;

[0042] Figure 3 This is a schematic diagram of the principle of human eye field divergence;

[0043] Figure 4 A partition display diagram of the eyeglass lens of the present invention;

[0044] Figure 5 Another partition display diagram of the eyeglass lens of the present invention;

[0045] Figure 6 This is an analysis and demonstration diagram of the fan-shaped design of the peripheral optical zone in the present invention;

[0046] Figure 7 It is a geometric model diagram of the nasal weak defocus area and the temporal strong defocus area in the present invention;

[0047] Figure 8 It is a topographic map of the defocus amount "contour lines" of the peripheral optical zone of the present invention;

[0048] Fig. 9 Schematic diagram of the relationship between the radius of curvature of the point-shaped or ring-shaped defocusing area and the radius of curvature of the central optical area of ​​the eyeglass lens of the present invention;

[0049] Fig.10 The focal power distribution diagram of the gradual defocusing area of ​​the spectacle lens of the present invention based on the pupil function at a defocusing amount of 2.0D and a viewing field of 0°;

[0050] Fig.11 The focal power distribution diagram of the gradual defocusing area of ​​the spectacle lens of the present invention based on the pupil function at a defocusing amount of 2.0D and a viewing field of 16°;

[0051] Fig.12 The focal power distribution diagram of the gradual defocusing area of ​​the spectacle lens of the present invention based on the pupil function at a defocusing amount of 1.5D and a viewing field of 0°;

[0052] Fig.13 The focal power distribution diagram of the gradual defocusing area of ​​the spectacle lens of the present invention based on the pupil function at a defocusing amount of 1.5D and a viewing field of 16°;

[0053] Fig.14 It is a point-like defocus distribution diagram of the present invention;

[0054] Fig.15 is the annular defocus distribution diagram of the present invention;

[0055] Fig.16 is a gradual defocus distribution diagram of the present invention;

[0056] In the figure: base lens A, central optical zone a, peripheral optical zone b, nasal weak defocus zone 1, temporal strong defocus zone 2, upper zone 3 for far vision, and soothing accommodation zone 4 for mid and near vision. DETAILED DESCRIPTION

[0057] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it. However, the embodiments cited are not intended to limit the present invention. In addition, specific weights, models, quantities, etc. appearing in the embodiments are only intended as preferred embodiments.

[0058] Embodiment 1:

[0059] like Figure 1-Figure 8 As shown:

[0060] A spectacle lens, comprising a substrate A, on which a central optical zone a and a peripheral optical zone b are provided, and the peripheral optical zone b is defocused by a defocusing module;

[0061] The peripheral optical zone b includes a nasal weak defocus zone 1, a temporal strong defocus zone 2, an upper zone 3 for distance use, and a soothing adjustment zone 4 for near and intermediate use;

[0062] The nasal weak defocus area 1 and the temporal strong defocus area 2 are respectively located on the left and right sides of the central optical area a and are arranged horizontally;

[0063] The upper zone 3 for far vision and the soothing adjustment zone 4 for intermediate and near vision are respectively located on the upper and lower sides of the central optical zone a, and are respectively located between the nasal weak defocus zone 1 and the temporal strong defocus zone 2 and are vertically distributed.

[0064] Four subareas of the peripheral optical zone b;

[0065] The average defocus amount of the weak defocus area 1 on the nasal side and the strong defocus area 2 on the temporal side is determined by actual measurement of the human eye. Usually, the defocus amount on the temporal side is greater than that on the nasal side.

[0066] The purpose of the upper zone 3 for farsightedness is to utilize the design advantages of aspherical lenses to solve the problem of spherical aberration indirectly causing farsightedness defocus, and to maintain the original nearsightedness defocus or no defocus state in the area above the eye;

[0067] The soothing adjustment zone 4 for near and medium distance uses linearly and gradually changes the defocus amount according to the angle of the eye's internal rotation to relieve near-distance eye strain;

[0068] The average defocus range of the nasal weak defocus area 1 and the temporal strong defocus area 2 is 0.50-5.0D, and the area range of the nasal weak defocus area 1 is -45° to +45°, and the area range of the temporal strong defocus area is +135° to -135°;

[0069] The upper zone 3 for far vision has a range of +45° to +135°, and the soothing adjustment zone 4 for near vision has a range of -135° to -45°;

[0070] The spectacle lenses are suitable for frame glasses or contact lenses, and the central optical zone a is circular or elliptical;

[0071] The diameter range of the central optical zone a applicable to frame glasses is 8-20 mm; the diameter range of the central optical zone a applicable to contact lenses is 3-7 mm;

[0072] The present application sets a central optical zone a and a peripheral optical zone b including a nasal weak defocus zone 1, a temporal strong defocus zone 2, an upper zone 3 for far use, and a soothing adjustment zone 4 for near and medium use; from the habit of human eyes looking at things, no matter we look up or down, the field of vision of human eyes is fan-shaped and divergent (such as Figure 3 );

[0073] The rule is that the closer to the eyes, the smaller the effective diameter is. For example, a contact lens with a diameter of 10mm is sufficient, but a frame lens requires a diameter of more than 30mm. At the same time, if you wear frame lenses, the distance L from the eyes varies from person to person.

[0074] The peripheral optical zones b in the present application are all designed in a fan-shaped manner, which can alleviate the problem of reduced field of view caused by different distances L of the human eye. For example, for square partitions, regardless of the distance L, the corresponding peripheral area has a constant width, which will cause the preset functions of each partition to not be fully used (such as Figure 6 );

[0075] In addition, the central optical zone a of the present application adopts a circular or elliptical shape because the incident light needs to be focused on the retina. Only when the light is focused on the retina can the wearer achieve the purpose of seeing clearly, and the various areas in the peripheral optical zone b adopt fan-shaped partitions, which can solve the poor vision caused by the difference in the distance between the lens and the eye, so that each functional area can be fully utilized; at the same time, when the human eye is rotating, it is easy to exceed the ideal use area. The use of fan-shaped areas can expand the use area to a greater extent and adapt to more actual human eye scenes;

[0076] For the nasal weak defocus area 1 and the temporal strong defocus area 2 in the present application, when the human eye looks far away, the horizontal field of view of humans is usually 120°, and when focusing attention, it is about one-fifth, that is, 25°. A geometric model can be established (such as Figure 7 );

[0077] When the field of view angle β=12.5° when looking straight ahead, assuming the pupil diameter PD=4.0mm, near eye distance L=12mm, then the diameter area of ​​the direct-view lens φ=9.32mm;

[0078] Therefore, the incident light of the central optical zone a in the present application needs to be focused on the retina. This area corresponds to the fovea of ​​the retina of the eye, which is the area that directly determines the visual acuity. If it deviates from the retina, it will cause blurred vision, which will greatly reduce the compliance of wearing the lens.

[0079] When looking straight ahead with a field of view angle of β=60°, assuming that the pupil diameter PD=4.0mm and the near eye distance L=12mm, the diameter area of ​​the direct-viewing lens φ=26.78mm;

[0080] Therefore, when looking straight ahead, we not only use the central optical zone a, but also the nasal weak defocus zone 1 and the temporal strong defocus zone 2. At this time, the off-axis incident light passes through the nasal weak defocus zone 1 and the temporal strong defocus zone 2 through the defocus design, so that the light passing through the nasal weak defocus zone 1 and the temporal strong defocus zone 2 is focused on the area outside the retinal fovea of ​​the eye (paracenter). Both theory and actual measurement show that if the same optical power as the central optical zone is used, it will usually focus behind the retina to form hyperopic defocus; although the paracenter imaging position outside the retinal fovea has almost no effect on vision, it does affect the growth rate of the eye axis. Hyperopic defocus will accelerate the growth of the eye axis and the deepening of myopia, while focusing on the retina (no defocus) or in front of the retina (myopic defocus) will not accelerate the growth of the eye axis; (such as Figure 1 ).

[0081] Embodiment 2:

[0082] like Fig. 9 , Fig.14 and Fig.15 As shown;

[0083] The defocus module adopts point defocus or ring defocus;

[0084] The diopter of the point-shaped or ring-shaped defocused area is:

[0085] (1-1)

[0086] In formula (1-1) is the diopter of the central optical zone a, and D is the defocus amount;

[0087] The relationship between the curvature radius of the point-shaped or annular defocusing area in the eye lens and the curvature radius of the central optical zone a is:

[0088] (1-2)

[0089] In formula (1-2), D is the defocus amount, n is the refractive index of the lens material, and d is the center thickness of the lens. is the radius of curvature of the lens defocus area, is the radius of curvature of the central optical zone of the lens, is the radius of curvature of the surface corresponding to the central optical zone a;

[0090] The characteristics of point defocus and ring defocus are that the point-shaped or ring-shaped raised or depressed areas are the defocus areas, and the refractive power of the remaining areas is the same as the refractive power of the central optical zone. These two defocus methods are mainly used for people who are more sensitive to changes in peripheral vision. This area improves the discomfort caused by peripheral myopia defocus by retaining part of the original refractive power of the central optical zone.

[0091] Embodiment three:

[0092] like Fig.10 , Fig.11 , Fig.12 , Fig.13 and Fig.16 As shown:

[0093] The defocus module also adopts gradual defocus;

[0094] The diopter of each point in the gradual defocus area is:

[0095] (1-3)

[0096] In formula (1-3), is the diopter of the central optical zone a, The distance from the center is The defocus amount at The distance from the center is The defocus amount at is the distance from a point in the gradient area to the center;

[0097] The average defocus amount in the gradual defocus area is:

[0098] (1-4)

[0099] The surface height in the gradual defocusing area is:

[0100] (1-5)

[0101] In formula (1-5), r is the position radius of the lens, c is the curvature at the vertex of the surface, k is the conic coefficient of the quadratic surface, and z is the surface height at position r;

[0102] The present application adjusts the surface shape sagitta at the same lens position, as shown in Table 1 below:

[0103] Table 1

[0104] Serial number Face shape Radius of curvature c Secondary coefficient K a1 a2 a3 Defocus distribution field of view corresponding diagram 1 Aspheric 89.033 0.989 <![CDATA[-4.789×10 -13 ]]> <![CDATA[-1.477×10 -29 ]]> <![CDATA[-2.635×10 -20 ]]> Fig.10 2 Aspheric 89.033 0.780 <![CDATA[4.003×10 -4 ]]> <![CDATA[5.45×10 -8 ]]> <![CDATA[4.003×10 -11 ]]> Fig.11

[0105] The geometric shape of the gradual defocus has no obvious convex or concave undulations, and the radius of curvature of each part of the area is continuously changing. This defocusing method with different parts is suitable for people who are not very sensitive to changes in peripheral vision.

[0106] Embodiment 4:

[0107] like Figure 4 and Figure 5 As shown:

[0108] The soothing adjustment area 4 for near and medium distance has an additional positive defocus amount;

[0109] By adding positive defocus, the eye is driven to relax the ciliary muscle to compensate for the convergence caused by the lens;

[0110] When the gaze distance is known to be L, the pupil distance at this time is PL, and the inward rotation angle at this time can be estimated by trigonometric function: ;

[0111] When θ=0, the defocus amount D=0; when the viewing distance is set to 25cm, the maximum defocus amount that the wearer can accept is D 25 , pupil distance is PL 25 , then the internal rotation angle is given by ; Assuming that the defocus amount changes linearly with the inward rotation angle, the relationship between the inward rotation angle of the eye and the defocus amount of the lens can be obtained as follows: .

[0112] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A spectacle lens, characterized in that: The eyeglass lens comprises a base lens (A), the base lens (A) is provided with a central optical zone (a) and a peripheral optical zone (b), and the peripheral optical zone (b) is defocused by a defocusing module; The peripheral optical zone (b) includes a nasal weak defocus zone (1), a temporal strong defocus zone (2), an upper zone for distance vision (3), and a soothing accommodation zone for near and intermediate vision (4); The nasal weak defocus area (1) and the temporal strong defocus area (2) are respectively located on the left and right sides of the central optical area (a) and are arranged horizontally; The upper zone for distance vision (3) and the soothing adjustment zone for near and intermediate vision (4) are respectively located on the upper and lower sides of the central optical zone (a), and are respectively located between the nasal weak defocus zone (1) and the temporal strong defocus zone (2) and are vertically distributed; The defocus module adopts point defocus or ring defocus; The diopter of the point-shaped or annular defocused area is: （1-1） In formula (1-1) is the diopter of the central optical zone (a), and D is the defocus amount; The relationship between the radius of curvature of the point-shaped or annular defocused area in the spectacle lens and the radius of curvature of the central optical zone (a) is: （1-2） In formula (1-2), D is the defocus amount, n is the refractive index of the lens material, and d is the center thickness of the lens. is the radius of curvature of the lens defocus area, is the radius of curvature of the central optical zone (a) of the lens, is the radius of curvature of the surface corresponding to the central optical zone (a).

2. The eyeglass lens according to claim 1, characterized in that: The defocus module also adopts gradual defocus; The diopter of each point in the gradual defocus area is: （1-3） In formula (1-3), is the diopter of the central optical zone (a), The distance from the center is The defocus amount at The distance from the center is The defocus amount at is the distance from a point in the gradient area to the center; The average defocus amount in the gradual defocus area is: （1-4） The surface height in the gradual defocusing area is: （1-5） In formula (1-5), r is the position radius of the lens, c is the curvature at the vertex of the surface, k is the cone coefficient of the quadratic surface, and z is the surface vector height at position r.

3. The eyeglass lens according to claim 1, characterized in that: The spectacle lens is suitable for frame glasses or contact lenses, and the central optical zone (a) is circular or elliptical.

4. The eyeglass lens according to claim 3, characterized in that: The diameter of the central optical zone (a) suitable for frame glasses is in the range of 8-20 mm; the diameter of the central optical zone (a) suitable for contact lenses is in the range of 3-7 mm.

5. The spectacle lens according to claim 1 or 2, characterized in that: The average defocus range of the nasal weak defocus zone (1) and the temporal strong defocus zone (2) is 0.50 to 5.0D, and the area range of the nasal weak defocus zone (1) is -45° to +45°, and the area range of the temporal strong defocus zone (2) is +135° to -135°.

6. The eyeglass lens according to claim 1, characterized in that: The upper zone (3) for far vision has a range of +45° to +135°, and the soothing adjustment zone (4) for near vision has a range of -135° to -45°.

7. The spectacle lens according to claim 1 or 6, characterized in that: The intermediate and near soothing accommodation zone (4) has an additional positive relative diopter.

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