CN217639822U

CN217639822U - Peripheral discrete smooth-rule astigmatic lens of stack

Info

Publication number: CN217639822U
Application number: CN202221219799.XU
Authority: CN
Inventors: 任建锋; 周谭; 徐梓榕; 颜蒙; 李春琦; 黄启泰
Original assignee: Suzhou University
Current assignee: Suzhou Mingshi Optical Technology Co ltd
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-10-21
Anticipated expiration: 2032-05-19

Abstract

The application belongs to the technical field of eye vision optics, and provides a superposed peripheral discrete smooth prescribed astigmatic spectacle lens which comprises a first optical surface and a second optical surface, wherein the first optical surface is far away from the eye side of a user; the first optical surface and the second optical surface form a main structure of the spectacle lens, a central area on the first optical surface is configured as a central bright visual area, and a discrete smooth scattered area is arranged around the central bright visual area; the central bright visual area is a smooth surface, the discrete smooth astigmatic area is configured into a micro lens array, and the single micro lens is configured with a ring curved surface in the smooth direction. The main structure images an object on the retina of a human eye, and the micro-lens array images the object in front of the retina; the image formed by the micro-array lens can induce the thickening of the choroid of the human eye to receive energy to the maximum extent possible, thereby inhibiting the myopia from deepening.

Description

Peripheral discrete smooth-rule astigmatic lens of stack

Technical Field

The application belongs to the technical field of eye sight and relates to an eyeglass.

Background

Nowadays, science and technology are developed day by day, and electronic products become an indispensable tool for people every day. Overuse of the eyes, especially for long-term use of electronic products, has become an important cause of myopia. The research report of the world health organization shows that the number of Chinese myopia patients reaches as many as 6 hundred million, the myopia rate of teenagers is the first world, and China has become the first myopia kingdom in the world. Therefore, refractive correction is performed only slowly.

From the current practice of orthokeratology and defocus lenses, the change of the refractive condition around the retina can induce the human eye to grow towards the back or front of the retina, so that the axis of the eye is increased or shortened, and the refractive state of the eyeball develops in the opposite direction. For example, designing a positive out-of-focus spectacle lens of a micro lens array can effectively solve the problem of the growth or shortening of the eye axis. The spectacle lens can relieve 40-60% of adolescent myopia progression.

According to the literature, for the human eye, the inverse-orthostatic corneal astigmatism refers to the regular corneal astigmatism in which the maximum power of the cornea is on the meridian of 180 degrees, or close to 180 degrees. The retrodirective corneal astigmatism is generally referred to as retrodirective astigmatism. When the regular cornea is astigmatic, the maximum power of the cornea is on the meridian more than 30 degrees from the vertical and meridian, so called oblique corneal astigmatism, and when fitting, correction is generally recommended for the retrospective astigmatism to obtain better visual effect.

Chinese patent CN 104678572B discloses an eyeglass lens, in which a plurality of small area lenses with a circular shape and a diameter of about 0.8 mm-2 mm are arranged in different areas to form a second dioptric area. The progression of myopia is inhibited by an image obtained in front of the retina by the second refractive region while visually distinguishing the image formed by the first refractive power. In the above scheme, as can be seen from the examples, the round microlenses for forming the second dioptric region are spherical, the image is slightly blurred, and the wearing discomfort of the user is relatively high in proportion during the fitting process.

The invention discloses an eyeglass (application number: 202010000666.2) with an annular cylindrical microstructure on the surface, which is disclosed by the invention patent in China, wherein a plurality of annular cylindrical microstructures with different radiuses are arranged in a regular nesting manner in a radial array by taking the geometric center of the eyeglass as the center of a circle in a specific caliber range of the eyeglass, and each annular cylindrical microstructure can generate relatively stable refractive power and high-order phase difference. The lens is mainly used for teenagers with relatively rapid myopia development or retina periphery hyperopia defocusing. Such lenses are not currently marketed in bulk, and there is no clear statement about the wearer's adaptability and corrective outcome.

The micro-lens technology of the multi-point out-of-focus lens on the market at present is a single myopia out-of-focus technology, and myopia deepening is inhibited by stimulating yellow spots. According to a research report (scientific Defocus Leads to Short-Term Changes in Human Choroidal Thickness,https://doi.org/10.1167/iovs.61.8.48university of queensland, australia, 2019), there is now evidence that direct astigmatic stimulation of the macular region of a human eye for a certain period of time can more effectively promote choroidal thickening, thereby inhibiting myopia progression in adolescents. The clinical experience presented in the article indicates that-3D astigmatic defocus stimulation will directly lead to adult choroidal thickening. All evidence suggests that axial differences in astigmatism are also one of the factors that affect the effects of myopia. Part of animal experiments and research on the correlation between early astigmatism and myopia development of children show that the myopia compliance astigmatism has potential myopia development resisting effect. It can also be found from some clinical studies on the ring focus lens that although the peripheral defocus is far less than the multi-point defocus and even does not reach the critical point for forming the myopic defocus at all, the effects on the myopic progression, which may be due to astigmatic stimulus caused by the manufacturing error of the ring focus edge, still exist.

According to the clinical study surface of a series of retinal periphery defocusing methods since smith monkey experiment, the defocusing stimulation of the retinal periphery is likely to influence the myopia development of children more than the stimulation of the center of the macula lutea. The same rule may exist for the stimulus of peripheral discrete astigmatism of the retina.

SUMMERY OF THE UTILITY MODEL

In order to better inhibit the myopic progression of the eye, the application provides a superimposed peripheral discrete-compliance spectacle lens comprising a first optical surface and a second optical surface which are corresponding, the second optical surface is close to the eye side of the user, and the first optical surface is far away from the eye side of the user; the first optical surface and the second optical surface form a main structure of the spectacle lens, a central area on the first optical surface is configured as a central bright visual area, and a discrete smooth scattered area is arranged around the central bright visual area; the central bright visual area is a smooth surface, the discrete smooth optical scattering area is configured into a micro lens array, and a single micro lens in the micro lens array is a toroidal curved surface.

The preferred scheme is as follows: the central photopic vision region shape comprises: one of circular, elliptical, polygonal, or lower nasal inward deflection; when the shape of the central bright visual area is circular, the envelope shape of the central bright visual area is circular; when the shape of the central bright visual area is a regular polygon, the envelope shape of the central bright visual area is a circle; when the shape of the central bright visual area is the lower nasal deviation, the envelope shape of the central bright visual area is an ellipse.

The surface shape of the second optical surface is one of a spherical surface (Sphere surface), an aspherical surface (Sphere surface), a Progressive addition surface (Progressive addition surface) and a toroidal surface (Toric surface).

The envelope dimensions of the preferred central bright field are configured to: the length of the transverse axis is 8-12mm, and the length of the longitudinal axis is 10-15mm.

The discrete smooth astigmatism area is configured outside the central bright vision area to 80% of the full aperture of the lens. The micro-lens array is not arranged in the area except the 80% of the aperture of the lens.

The arrangement mode of the micro-lens array is that the micro-lenses are uniformly distributed and arranged on the ring belt or are distributed and arranged in the same area as the occupied area of the micro-lenses. The uniformly distributed arrangement on the ring belt is to calculate an equi-division angle by the opening angle of two adjacent microlenses in the microlens array relative to the central point of the lens; for example: a circle needs 30 rows of microlenses, and the angle between the two adjacent microlenses with respect to the center point is 360/30=6 °. The occupied area equal-area distribution arrangement is that the areas occupied by the adjacent micro lenses are divided by regular hexagons, and the area of the hexagon occupied by each micro lens is equal. It should be noted that: whether the angle is bisected or the area is occupied, is independent of the size of the individual microlenses.

Each microlens in the array of microlenses is an out-of-focus point in a discrete, smooth zone of astigmatism, and the maximum diameter of the envelope of each microlens is between 1.8-3.2 mm.

The method for calculating the area of the discrete smooth scattered light area comprises the following steps: the percent area occupied is calculated from the pupil diameter and the microlens envelope size. The diameter of the pupil of a human eye is generally larger than 4mm, and the area of the stimulation area needs to be ensured to be about 20 to 80 percent of the area of the pupil in any lens micro-lens area used during oblique fixation.

Drawings

FIG. 1 is a cross-sectional view of a superimposed peripheral discrete compliant astigmatic ophthalmic lens;

wherein 1 is a first optical surface, 2 is a second optical surface, 3 is a discrete cis-normal diffusion region, and 4 is a central bright field.

FIG. 2 is a front view of a superimposed peripheral discrete compliant astigmatic ophthalmic lens;

wherein OD is the aperture of the discrete smooth optical area, OD is the aperture of the first optical surface, and ID is the envelope size of the central clear view area.

FIG. 3 is a three-dimensional view of a microlens;

wherein r11 is the curvature radius of the microlens array axis, and r12 is the curvature radius of the microlens array in the direction orthogonal to the microlens array axis.

Fig. 4 is a schematic shape diagram of a central bright visual area.

FIG. 5 is a schematic diagram of the shape contrast of the imaging points of the spherical mirror and the microlens array in the form of the toroidal curved surface on the sub-focal plane.

FIG. 6 is a schematic diagram of a superimposed peripheral discrete compliant astigmatic ophthalmic lens in an embodiment in a retinal imaging position;

wherein F is the focal length of the main structure, F is the focal length of the micro-lens array, and d is the distance between the main focal plane and the secondary focal plane.

FIG. 7 is a schematic diagram showing an angle between an axial direction of the toroidal curved surface and an axial direction of the lens.

Figure 8 is a schematic diagram of the area of the retinal imaging stimulation area of the microlens array as a percentage of the area of the pupil.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present invention is further described below with reference to the accompanying drawings and embodiments. The terms "first", "second", and the like in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated.

Examples

A superimposed peripheral discrete compliant astigmatic ophthalmic lens, as shown in fig. 1, comprising a first optical surface 1 and a second optical surface 2 corresponding thereto, the second optical surface being closer to the eye side of a user and the first optical surface being further away from the eye side of the user; the central area on the first optical surface is configured as a central bright visual area 4, and discrete smooth optical areas 11 are arranged around the periphery of the central bright visual area; the central bright visual area is a smooth surface, the discrete smooth optical area 3 is configured into a micro lens array, and the micro lens array is configured into a ring curved surface.

As shown in fig. 2, OD on the first optical surface is the caliber of the discrete, smooth optical area, OD is the caliber of the first optical surface, ID is the envelope size of the central clear zone, preferably OD <0.8 OD, i.e.: the caliber of the discrete smooth light scattering area does not exceed 80% of the caliber of the first optical surface.

The personalized customization design steps of the superposed peripheral discrete smooth astigmatism spectacle lens in the application are as follows:

1) Determining diopter D of the lens, spherical power D1 of the toroidal surface and cylindrical power D2 according to prescription parameters of the prescription;

2) Calculating the sizes of the micro lenses in the micro lens array;

3) Calculating a curvature radius r1 of a first optical surface and a curvature radius r2 of a second optical surface of the lens according to the refractive index n and the diopter D of the lens;

4) Calculating the axial curvature radius r11 of the micro-lens array and the axial orthogonal curvature radius r12 of the micro-lens array according to the diopter D of the lens, the refractive index n of the lens, the spherical power D1 of the toroidal surface, the cylindrical power D2 and the curvature radius r2 of the second surface; and the first optical surface is finished.

In the microlens shown in fig. 3, r11 is the radius of curvature of the microlens array in the axial direction, and r12 is the radius of curvature of the microlens array in the direction perpendicular to the axial direction.

The envelope of the central bright region comprises as shown in fig. 4: one of a circle, an ellipse, a polygon, a waist shape or a lower nasal deviation shape; when the shape of the central bright visual area is circular, the envelope shape of the central bright visual area is circular; when the shape of the central bright visual area is a regular polygon, the envelope shape of the central bright visual area is a circle; when the shape of the central bright visual area is the lower nasal deviation, the envelope shape of the central bright visual area is an ellipse.

As shown in fig. 5, the imaging point of the conventional spherical mirror on the sub-focal plane is circular, and the microlens array in the form of the toroidal curved surface is used in the scheme, the point focused on the front of the retina is elliptical, and one major axis and one minor axis are used, so that the imaging effect on stimulation of human eyes is better.

In the technical scheme, the first optical surface and the second optical surface form a main structure of the spectacle lens, and the micro-lens array is superposed on the main structure, as shown in fig. 6, the main structure images an object on a main focal plane (on the retina of a human eye), and the retina can sense the existence of the object; the microlens array images the object in the sub-focal plane (in front of the retina), similar to the situation where there are small energy spots formed in front of the retina, F is the main structure focal length, F is the microlens array focal length, and d is the distance between the main focal plane and the sub-focal plane. The energy point of the part of the optical passing microlens deviates from the main image surface, which can stimulate the retinal cells to continue growing to reach a small energy point, it can be understood that the imaging point of the microlens array has a stimulation to the retina of the human eye, and the stimulation to the retina can induce the choroid to thicken, thereby inhibiting the myopia from increasing.

Fig. 7 is a schematic diagram of an angle between an axial direction of the toroidal curved surface and an axial direction of the lens, where the angle between the axial direction of the toroidal curved surface and the axial direction of the lens has a great influence on the wearing comfort of the human eye, and if the angle exceeds ± 30 degrees, a strong vertigo feeling is caused. Therefore, in order to reduce the wearing comfort, the axial included angle of the annular curved surface is not more than +/-30 degrees.

Fig. 8 is a diagram showing the percent area of the imaging stimulation area of the microlens array retina to the pupil area, for example, the pupil diameter is 4mm,

envelope diameter = sqrt (pi 4 × 4/4 × 20%/pi) = 2.8mm at 20% stimulation region;

envelope diameter = sqrt (pi 4 × 4/4 × 80%/pi) = 2.6 mm at 80% stimulated region;

wherein the envelope diameter is selected to take into account the sensitivity of the wearer. Generally, the method is selected by referring to a table 1, wherein the wearer customizes a microlens envelope diameter corresponding table of the defocused spectacle lens.

If the wearer is relatively insensitive to light, the envelope diameter from the focal point can be selected in descending order.

TABLE 1 wearer customized out-of-focus spectacle lens microlens envelope diameter correspondence table

A specific application example is given below. Some myope, age 13 years old wears frame glasses before, diopter 2.5D of lens, new optometry bore hole diopter 3D, considers that this patient uses the eye more on class every day, and is more sensitive to the light, selects synthetically:

according to a table 1, customizing a defocusing spectacle lens microlens enveloping diameter corresponding table by a wearer, selecting a lens with a stimulation area accounting for 65 percent of pupil in the range of 12-15 years old, wherein the microlens enveloping diameter is 3.2mm; the lens is a resin lens with refractive index n 1.499; the spherical power D1 of the toroidal curved surface is +1D, the cylindrical power D2 is-3D, and the compliant angle, namely the included angle between the axial direction of the toroidal curved surface and the axial direction of the lens is 0 degree;

by looking up the lens manufacturing compatibility table, the curvature radius r2=104.6mm of the second optical surface can be known;

according to the formulas (1) to (3), there are:

r1=281.83 is calculated;

calculated r11=647.6mm;

r12=132.34mm is calculated;

thus, the parameters of the superimposed peripheral discrete compliant astigmatic ophthalmic lens can be determined.

The patient wears the superposed peripheral discrete smooth astigmatic spectacle lens for one week, and can continue wearing the spectacle lens if no discomfort exists, and the patient can perform optometry once every 2 months. If there is strong discomfort, it is considered to reduce the cylinder power from-3D to-2D or-1D to reduce the stimulating effect.

Claims

1. A superimposed peripheral discrete compliant astigmatic ophthalmic lens comprising: a first optical surface and a second optical surface corresponding to each other, the second optical surface being close to the eye side of the user, the first optical surface being far from the eye side of the user; the central area on the first optical surface is configured to be a central bright area, and a discrete smooth scattered light area is arranged around the central bright area; the central bright visual area is a smooth surface, the discrete smooth optical scattering area is configured into a micro lens array, and a single micro lens in the micro lens array is a toroidal curved surface.

2. A superimposed peripheral discrete compliant astigmatic ophthalmic lens according to claim 1 wherein:

the central photopic vision region shape comprises: one of a circle, an ellipse, a polygon or a lower nasal profile;

wherein: when the shape of the central bright visual area is circular, the envelope shape of the central bright visual area is circular;

when the shape of the central bright visual area is a regular polygon, the envelope shape of the central bright visual area is a circle;

when the shape of the central bright visual area is the inner deflection of the lower nose, the enveloping shape of the central bright visual area is an ellipse.

3. A superimposed peripheral discrete compliant astigmatic ophthalmic lens according to claim 1, wherein: the profile of the second optical surface comprises: one of a spherical surface, an aspherical surface, a progressive surface, and a toroidal surface.

4. A superimposed peripheral discrete compliant astigmatic ophthalmic lens according to claim 1 wherein: the envelope size of the central bright field is configured as: the length of the transverse axis is 8-12mm, and the length of the longitudinal axis is 10-15mm; each microlens in the microlens array is located one of the discrete areas of the cis-power dispersion from the focal point, and the maximum diameter of the envelope of each microlens is between 1.8mm and 3.2 mm.

5. A superimposed peripheral discrete compliant astigmatic ophthalmic lens according to claim 1 wherein: the discrete smooth astigmatism area is arranged outside the central bright vision area until 80% of the total aperture of the lens, and the area outside 80% of the aperture of the lens is not provided with the micro lens array.

6. A superimposed peripheral discrete compliant astigmatic ophthalmic lens according to claim 1, wherein: the arrangement mode of the micro lens array is that the micro lens array is uniformly distributed and arranged on the ring belt or is distributed and arranged in the same area as the occupied area of the micro lens array.

7. A superimposed peripheral discrete compliant astigmatic ophthalmic lens according to claim 1, wherein: the astigmatism direction of the toric surface is in the normal direction, i.e., at +/-30 degrees.