CN112068331A - A kind of personalized peripheral myopia defocus spectacle lens and design and preparation method - Google Patents

Abstract

The invention relates to a personalized peripheral myopia defocus spectacle lens and a design and preparation method. The degree of emmetropia and the refractive power of the naked eye in each viewing angle direction of the myopic patients were measured respectively, and the peripheral hyperopic defocus value of the myopic patients was obtained; Taking 105% to 120% of the peripheral hyperopic defocus value of the corresponding myopic patient as the dioptric power compensation value, the lens is designed to compensate for the asymmetric peripheral dioptric power, and the initial lens sag is obtained and then based on the spectacle frame to be worn by the myopic patient. parameters, using the additional prism method to correct the initial lens sag to obtain a personalized peripheral myopia defocus spectacle lens. The spectacle lenses provided by the invention are suitable for teenagers to wear, and can not only correct vision, but also restrain the eyeball from being elongated backwards in the growing period, and control the deepening of myopia;

Description

A kind of personalized peripheral myopia defocus spectacle lens and design and preparation method

technical field

The invention relates to spectacle lenses for correcting myopia, in particular to a myopic defocusing spectacle lens for correcting retinal peripheral hyperopia and defocusing, and a design and preparation method thereof.

Background technique

Since the physiological structure of the retina itself is not a standard spherical surface, the peripheral curvature tends to be steeper than the central macular part. Only objects facing the central field of view of the eye, that is, on-axis and paraxial objects, are just imaged in the fovea of the eye, while objects outside the central field of view are imaged exactly in the fovea of the eye. The off-axis object is imaged on the posterior side of the peripheral retina beyond the fovea, which is called peripheral hyperopic defocus. See Figure 1, which is a schematic diagram of naked eye peripheral hyperopic defocus imaging. That is to say, the naked eye itself has relative hyperopia and defocusing RPRE (relative peripheral refractive error). For myopia in the eye that focuses distant objects in front of the retina, it is usually corrected with monofocal myopic lenses. Since monofocal myopia only corrects the central vision the most clearly, after the wearer is equipped to correct the partial vision of the central macular, this relative peripheral defocusing will be converted into absolute peripheral defocusing. Moreover, the off-axis aberration inherent in monofocal myopic lenses can exacerbate this peripheral hyperopic defocus. It has been found in the measurement of the nasal and temporal peripheral refractive power using the open refractometer for many times that the peripheral hyperopia defocus of most myopic people is higher than that of the naked eye after wearing glasses. Current research shows that, especially for adolescents, peripheral hyperopic defocus can induce the eye adaptive system to promote the posterior growth of the eye axis, resulting in accelerated growth of the eye axis and further deepening of myopia. Judging from the application of peripheral myopic defocusing orthokeratology lenses and soft multifocal contact lenses to control myopia in recent years, peripheral myopic defocusing can help reduce the axial length of the eye when the central macular region of the retina is accurately corrected growth, slowing the progression of myopia and reducing the final degree of myopia.

At the same time, the clinical testing practice in recent years has shown that the distribution of hyperopic defocus in the peripheral retina of children with myopia is different for different individuals and the upper, lower, left, right, near and far axes of the same individual. The temporal side is larger than the nasal side, and the larger the angle, the more obvious it is. Ordinary defocus lenses that reduce peripheral hyperopia do not take into account the differentiated actual measured values of peripheral defocusing of the human eye, and directly use unified empirical values. The effect will be compromised, thereby reducing the functionality of the lens to slow the growth of the eye axis.

。参见附图3，为现有技术中佩镜者戴上眼镜后镜片呈现水平倾斜的示意图；相对于正面视线的垂直平面存在有水平方向倾斜，左镜水平倾斜角

，右镜水平倾斜角。与镜片无倾斜的状态相比，镜片的倾斜使光线通过镜片后发生偏转，增大镜片的棱镜效应，中心视场的近轴物体成像发生偏离，中心视场外的离轴物体成像于黄斑中心凹以外的周边视网膜后移距离上下左右各不对称，人眼实际感受到的棱镜作用、光焦度、像散都发生变化，除了给佩镜者带来不适感外也易对眼睛造成不良影响。这种不适将影响佩戴者使用周边近视离焦眼镜的依从性，从而最终影响镜片使用效果。而这种由于眼镜的配戴造成的镜片倾斜也导致人眼实际接收的近视离焦补偿值偏离原设计值，使近视离焦效果打折扣。In addition, the glasses worn by myopic patients are made of lenses embedded in the spectacle frame and are placed on the bridge of the nose. Referring to FIG. 2, it is a schematic diagram of the vertical inclination of the lens after the wearer puts on the glasses in the prior art; the lens is inclined in the vertical direction relative to the frontal line of sight of the eye, and the vertical inclination angle

. Referring to FIG. 3, it is a schematic diagram of the horizontal inclination of the lens after the wearer puts on the glasses in the prior art; there is a horizontal inclination relative to the vertical plane of the frontal line of sight, and the horizontal inclination angle of the left mirror

, the horizontal tilt angle of the right mirror. Compared with the non-tilt state of the lens, the tilt of the lens causes the light to be deflected after passing through the lens, increasing the prism effect of the lens, the imaging of the near-axis object in the central field of view is deviated, and the off-axis object outside the central field of view is imaged in the center of the macula. The receding distance of the peripheral retina other than the concave is asymmetrical up and down, left and right, and the prism action, optical power, and astigmatism actually felt by the human eye will change, which will not only bring discomfort to the wearer, but also cause adverse effects on the eyes. . This discomfort will affect the wearer's compliance with peripheral myopia and defocus glasses, which will ultimately affect the use of the lenses. And the lens tilt caused by wearing the glasses also causes the myopia defocus compensation value actually received by the human eye to deviate from the original design value, which reduces the myopia defocus effect.

Chinese invention patent CN101317120B provides a lens designed to correct the peripheral hyperopia defocus of the retina, providing two optical correction areas in the form of rotational symmetry, respectively correcting the myopia or hyperopia associated with the foveal area and the peripheral area of the eye; Chinese invention patent CN101663609B considers the amplitude of the wearer's eyeball and head movements, and determines the lens center correction area associated with the fovea area of the eye and the lens peripheral correction area associated with the retinal peripheral area; Chinese invention patent CN104090381A provides a nasal Lenses with different correction powers were prepared for the lateral and temporal sides, and the correction power for the nasal side was greater than the correction power for the temporal side. The prior art solution neither mentions the targeted design based on the actual measurement value of the near-sightedness and defocusing of the naked eye retina, nor the influence of the tilt of the lens after the wearer wears the glasses assembled with the lenses embedded in the spectacle frame.

SUMMARY OF THE INVENTION

Aiming at the deficiencies in the prior art, the present invention provides a personalized peripheral myopic defocusing spectacle lens suitable for teenagers to wear, which can not only correct vision, but also restrain the eyeball from being elongated backward in the growing period and control the deepening of myopia, and Design and preparation methods.

The technical solution for realizing the purpose of the present invention is to provide a design method for a personalized peripheral myopic defocus spectacle lens, and the design of the inner surface of the lens includes the following steps:

(1) The degree of emmetropia and the refractive power of the naked eye in each visual angle direction of the myopic patients were measured respectively. Each visual angle direction included 10 degrees, 20 degrees and 30 degrees on the nasal side of the naked eye, and 10 degrees, 20 degrees and 30 degrees on the temporal side. The distance of 10 degrees and 20 degrees of upper vision and the near vision of 10 degrees and 20 degrees of lower vision; the difference between the measured refractive power of each viewing angle direction and the patient's emmetropia refractive power is the peripheral hyperopic defocus value of myopic patients;

(2) Determine the position of the intersection of the sight line and the lens in each viewing angle direction of the myopic patient, where the point corresponding to the near-sightedness of 10 degrees is deviated to the nasal side by 1 mm, and the point corresponding to the 20-degree angle of view is deviated to the nasal side by 2 mm. The obtained 10 position points are the reference points for the power compensation designed by the lens;

(3) For each refractive power compensation reference point in step (2), take 105% to 120% of the peripheral hyperopic defocus value of the myopic patient corresponding to step (1) as the refractive power compensation value, and perform asymmetrical adjustment on the lens. Peripheral power compensation design to obtain the initial lens sag;

(4) According to the spectacle frame parameters to be worn by myopic patients, the additional prism method is used to correct the initial lens sag to obtain a personalized peripheral myopia defocus spectacle lens.

The parameters of the spectacle frame of the present invention include the distance between the eyes of the myopic patient after wearing the spectacles, the vertical inclination angle and the horizontal inclination angle of the spectacle frame; the additional prism is set, and the vertical sagittal height difference is 3-5.5 mm, and the horizontal sagittal height difference is 2.2 mm. ~4.5mm.

The technical solution of the present invention also includes a personalized peripheral myopia defocus spectacle lens obtained by the above-mentioned design method.

For the individualized peripheral myopia defocus spectacle lens, the central refractive power of the lens obtained according to the degree of emmetropia of myopic patients is -1.00D to -10.00D; the outer surface of the lens is spherical.

The technical solution of the present invention provides a method for preparing a personalized peripheral myopic defocus spectacle lens, and the inner surface of the lens is processed in a workshop.

In order to accurately compensate for the defect of peripheral hyperopic defocusing caused by children wearing ordinary myopia glasses, which leads to myopia deepening, and to compensate for the inclination of the lenses after the wearer wears glasses assembled with lenses embedded in the spectacle frame, the image is imaged behind the peripheral retina. To overcome the insufficiency of the asymmetry of the shift distance, the present invention provides a peripheral myopic defocus lens designed in accordance with the frame inclination, the lens distance, and the peripheral hyperopic defocus measurement value of the retina of the myopic eye, and the lens outside the central field of view is myopic lens. The degree is lower than the degree of the central field of view, and according to the measured peripheral hyperopia defocus value of the myopic eye, the differential compensation of the asymmetrical power of the upper, lower, left and right is designed; the lens is also equipped with prism compensation, so that the off-axis object is basically symmetrically imaged on the periphery The front part of the retina reduces the stimulation of axial lengthening and plays a role in controlling the deepening of myopia. Referring to FIG. 4, it is a schematic diagram of the effect of a personalized peripheral myopic defocus imaging principle provided by the present invention; after a myopic patient wears a myopic defocus lens 5, the light emitted by the object in the central field of view of the object 6 in the field of view 2 is imaged in the fovea 1 of the retina, and the rays 3 and 4 emitted by the off-axis object are imaged before the peripheral retina, and the hyperopic defocus is changed to myopic defocus.

Compared with the prior art, the beneficial effects of the present invention are:

1. The optical power in the four directions around the lens is compensated for the actual measurement value. The central area of the lens produces a sharp correction for the central vision of the eye, and the peripheral area of the lens produces myopic defocus correction for the peripheral vision of the eye. The realization includes clear vision in the central part and defocusing of myopia in the peripheral part, which not only ensures the clear vision of teenagers under heavy study, but also takes into account the function of the lens to delay the deepening of myopia.

2. The compensation value at each reference point of the power compensation around the periphery of the lens is compensated according to the actual measurement value of the relative hyperopia (RPRE value) of the nearsighted eye relative to the peripheral hyperopia (RPRE value) of the open focimeter, which can realize more accurate positions of each position. The myopic defocus compensation function of the current myopic defocus lens takes into account the astigmatism factor and the myopia defocus margin is not large, this precise compensation value distribution can undoubtedly better ensure the myopic defocus function in all directions. And there is a sufficient amount of correction compensation in practical applications.

3. The increase in the amount of astigmatism and defocusing of the lens is an important factor affecting the wearing comfort of myopic defocusing lenses. The compensation value set by the lens provided by the present invention is 105% to 120% of the measured value of peripheral hyperopia defocusing, which fully considers the current design and processing conditions of the continuous surface myopia defocusing lens, the increase of compensation value brings about The increase of synchronous astigmatism may cause the increase of the lens wearing discomfort ratio, so choose an appropriate ratio of compensation value and measured value. At the same time, it takes into account the function of the peripheral myopia and defocusing of the lens and the wearing compliance of the wearer, which can better play the role of the lens in deepening the prevention and control of myopia.

4. The peripheral myopia defocus compensation value of the lens design is between 105% and 120% of the peripheral hyperopic defocus value of the myopic patient, and the fluctuation of the compensation value is to realize the peripheral myopia defocus compensation value of the lens from the center of the macula to the near. The axis and the far axis maintain a basic uniform acceleration change, which not only conforms to the measurement data law of the existing open focimeter for the naked eye peripheral vision of myopia, but also meets the requirements of the human eye for the wearing comfort of the lens.

5. The lens takes into account the difference in the amount of defocusing around the actual visual object caused by the close-up eye collection. The lens has an inward deviation of 1 mm towards the nose side at the reference point of the near vision area at a 10-degree angle of view, and a 20-degree angle of view. The near reference point has a 2mm inward deviation to the nasal side, which provides better wearing comfort when reading gaze at close range.

6. The prism compensation value designed considering the influence caused by the tilt of the lens, the wearer will get the real customer perception degree, instead of the ordinary lens instrument measuring the degree, which greatly reduces the possible existence of the frame glasses due to the actual wearing of the frame. The aberration interference caused by the position further effectively guarantees the implementation of the function of the lens.

Description of drawings

Figure 1 is a schematic diagram of naked eye peripheral hyperopia defocus imaging;

Fig. 2 is the schematic diagram of the vertical inclination of the lens after the glasses wearer puts on the glasses in the prior art;

Fig. 3 is the schematic diagram of the horizontal inclination of the lens after the glasses wearer puts on the glasses in the prior art;

4 is a schematic diagram of the effect of a personalized peripheral myopia defocus imaging principle provided by the present invention;

5 is a schematic diagram of the position of a reference point for refractive power compensation on a personalized peripheral myopic defocus spectacle lens provided by an embodiment of the present invention;

Fig. 6 is the optical power distribution diagram of the initial peripheral myopic defocus spectacle lens provided in Embodiment 1 of the present invention;

7 is a diagram of the myopic defocus distance imaged on the longitudinal meridian of the peripheral myopic defocus spectacle lens according to Embodiment 1 of the present invention;

8 is a diagram of the myopic defocus distance imaged on the lateral horizontal line of the peripheral myopic defocus spectacle lens provided in Embodiment 1 of the present invention;

Fig. 9 is the optical power distribution diagram of the peripheral myopia defocusing spectacle lens provided in Embodiment 2 of the present invention;

10 is a diagram of the myopic defocus distance imaged on the longitudinal meridian of the peripheral myopic defocus spectacle lens provided by Embodiment 2 of the present invention;

11 is a diagram of the myopic defocus distance imaged on the lateral horizontal line of the peripheral myopic defocus spectacle lens provided in Embodiment 2 of the present invention;

FIG. 12 is a power distribution diagram of a peripheral myopic defocus spectacle lens provided in Embodiment 3 of the present invention;

13 is a diagram of the myopic defocus distance imaged on the longitudinal meridian of the peripheral myopic defocus spectacle lens according to Embodiment 3 of the present invention;

14 is a diagram of the myopic defocus distance imaged on the lateral horizontal line of the peripheral myopic defocus spectacle lens provided in Embodiment 3 of the present invention;

In the figure, 1. The fovea of the retina; 2. The light emitted by the object in the central field of view; 3, 4. The light emitted by the off-axis object; 5. The wearing myopic defocus lens; 6. The object in the field of view.

Detailed ways

The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

Example 1

This embodiment takes a refractive error patient's right eye with a myopia degree of -2D as an example, and provides an individually designed peripheral myopic defocus spectacle lens, the outer (front) surface of which is spherical, and the inner (back) surface is For asymmetric torus, the inner surface is designed as follows:

The open focimeter measured the patient's naked eyes with 10 degrees, 20 degrees, and 30 degrees on the nasal side, 10 degrees, 20 degrees, and 30 degrees on the temporal side, 10 degrees, 20 degrees, and near vision. Peripheral hyperopic dioptric power defocus values at viewing angles of 10 degrees and 20 degrees are listed in the first column of Table 1, "Naked Eye Hyperopic Defocus Value (D)", where D is the symbol of the diopter unit. It shows that the hyperopic defocus increases significantly with the increase of the viewing angle, and the temporal side is larger than the nasal side, and the far vision area is slightly larger than the near vision area. The designed lens should not only correct the vision of the central field of view, but also the function of correcting the vision of the peripheral field of view. It is necessary to gradually reduce the degree of myopia from the center of the lens, that is, there must be asymmetric positive dioptric power compensation up and down and left and right. The compensation of the nasal side is less than that of the temporal side, and the compensation of the near vision area is slightly less than that of the far vision area.

At the same time, it was also measured that the upper part of the spectacle lens was inclined outward by 9°, the right half of the lens (temporal side) was inclined inward by 7°, and the eye distance was 12.5 mm. The refractive index of the lens material to be designed is 1.597, the refractive power of the front surface is 4.0D, the radius of curvature is 149.2 mm, the thickness of the lens is 1.2 mm, and the spherical power of the rear surface is 6.0D.

Usually the center of rotation of the myopic eye is 14.5 mm behind the cornea, plus the distance between the lens and the eye is 12.5 mm, and the distance from the center of eye rotation to the center of the lens is 27 mm. , Temporal side, farsightedness, nearsightedness, a total of 10 reference points for diopter compensation, among which, the point corresponding to near vision 10 degrees is offset to the inside of the nose by 1 mm, and the point corresponding to the angle of 20 degrees is offset to the nose side by 2 mm; Referring to FIG. 5 , it is a schematic diagram of the position of the reference point for refractive power compensation on a personalized peripheral myopic defocus spectacle lens provided by this embodiment; the distance from each reference point position to the center of the lens is shown in the second column of Table 1 "Lens" Reference point position (mm)”. The power compensation value of each power compensation reference point is based on the measurement of naked-eye hyperopic defocusing. Considering that the myopic lens will further increase the farsighted defocus for off-axis objects in the peripheral field of view, and with the increase of the field of view As the angle increases, the compensation value is designed to be 105% to 120% of the measured value of naked eye hyperopia defocus, and the compensation percentage of the reference point farther from the center of the lens is also larger. The selection of the percentage should also ensure that the optical power compensation value maintains a substantially uniform acceleration change from the central field of view to the near-axis and far-axis fields of view. The power compensation value of each power compensation reference point is shown in the third column of Table 1, "Lens Power Compensation Value (D)". The power compensation is realized by aspheric design and additional asymmetric toroidal correction sag. , to get the initial lens sag. Referring to FIG. 6 , the optical power distribution diagram of the initial peripheral myopic defocus spectacle lens provided in this embodiment.

From the spectacle frame parameters measured above, the Emsley modified simple eye model is used to perform ray tracing and off-axis beamlet imaging formula calculations on the initial lens to obtain images of objects in the central field of view and off-axis objects in the peripheral field of view. For the distance from the retina, see FIG. 7 , which is a diagram of the myopic defocus distance imaged on the longitudinal meridian of the peripheral myopia defocus spectacle lens provided by this embodiment; see FIG. 8 , which is the peripheral myopia provided by this embodiment. The myopic defocus distance map of the image on the lateral horizontal line of the defocused spectacle lens; the dotted curves in Figure 7 and Figure 8 represent the imaging situation of the light passing through the initial lens longitudinal meridian and the lateral horizontal line respectively: the paraxial object in the central field of view is imaged at On the retina, off-axis objects outside the central field of view are imaged in front of the peripheral retina, presenting as myopic defocusing, showing the effect obtained by the lens through power compensation. The distance of the formed image from the retina is listed in the fourth column of Table 1, "Defocus distance before prism compensation (mm)" ("before prism compensation" refers to the "initial lens"), in the direction with a large viewing angle The myopic defocusing of the formed image is more obvious.

However, it can also be seen that due to the tilt of the lens, the prism effect of light passing through the lens, the image formed by the off-axis object in front of the retina has the phenomenon of asymmetry between the nasal side and the temporal side, distance and near vision, so in the initial lens The additional prism sag on the inner surface sag further performs prism compensation on the lens to obtain the individually designed sag of the peripheral myopia defocus spectacle lens. The solid curves in Figures 7 and 8 represent the imaging conditions of the light passing through the longitudinal meridian and the lateral horizontal line of the lens after prism compensation respectively. It can be seen that the asymmetry is improved after prism compensation, and the distance outside the central field of view Axial objects are imaged substantially symmetrically in front of the peripheral retina. The distance of the formed image from the retina is listed in the fifth column of Table 1 "Defocus distance (mm) after prism compensation".

Table 1

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The sag of the obtained individually designed peripheral myopia defocus spectacle lenses is input into a free-form surface numerical control machine tool, and the inner surface of the lens blank is cut to obtain the personalized peripheral myopia defocus spectacle lenses.

Example 2

This embodiment takes a refractive error patient's left eye with a myopia of -6.5D as an example, and provides an individually designed peripheral myopic defocus spectacle lens, the outer surface of which is spherical and the inner surface is an asymmetric toroid. See Example 1 for the design and preparation of the inner surface.

In this embodiment, the open-type focimeter is used to measure the patient's naked eyes with 10 degrees, 20 degrees, and 30 degrees of viewing angles on the nasal side, 10 degrees, 20 degrees, and 30 degrees on the temporal side, and 10 degrees, 20 degrees, and 20 degrees on the temporal side. Peripheral hyperopic defocus values at viewing angles of 10° and 20° below are listed in the first column of Table 2, "Nude-eye hyperopia defocus value (D)"; the distance from the center of eye rotation to the center of the lens is 27.5 The positions of the 10 reference points for refractive power compensation on the upper nasal side, temporal side, distance vision and near vision of the lens are calculated in millimeters, see the second column of Table 2 "Lens Reference Point Position (mm)"; the reference points for each refractive power compensation The refractive power compensation value is shown in the third column of Table 2, "Lens Power Compensation Value (D)". After aspherical design and additional asymmetric toroidal correction sag, the peripheral myopia defocusing glasses can achieve refractive power compensation. The optical power distribution of the film is shown in Figure 9. The upper part of the spectacle lens is inclined outward by 9°, the left half (temporal side) is inclined inward by 7°, the refractive index of the lens material is 1.597, the curvature radius of the front surface is 597 mm, and the refractive power is 1.0D; the central refractive power of the rear surface is 7.5D , the lens center thickness is 1.2 mm.

Perform ray tracing and off-axis beamlet imaging formulas to obtain the distances from the retina of images formed by objects in the central field of view and off-axis objects in the peripheral field of view as shown in Figure 10 and Figure 11 . It can also be seen that the lens provided in this embodiment exhibits myopic defocus imaging. The distance from the retina of the image formed without prism compensation is listed in the fourth column of Table 2 "Defocusing distance before prism compensation (mm)", and the distance from the retina of the lens after prism compensation is listed in the fifth column of Table 2. listed in the column "Defocus distance after prism compensation (mm)".

Table 2

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Example 3

In this embodiment, the right eye of a patient with refractive error has a spherical diopter of -4D and an axis of -2D astigmatism of 20 degrees as an example. An individually designed peripheral myopic defocus spectacle lens is provided, the outer surface of which is a spherical surface, and the inner surface is an asymmetric toroidal surface. Refer to Example 1 for the design and preparation method of the inner surface.

In this embodiment, the open-type focimeter is used to measure the patient's naked eyes with 10 degrees, 20 degrees, and 30 degrees of viewing angles on the nasal side, 10 degrees, 20 degrees, and 30 degrees on the temporal side, and 10 degrees, 20 degrees, and 20 degrees on the temporal side. Peripheral hyperopic defocus values at viewing angles of 10° and 20° below are listed in the first column of Table 3, "Nude-eye hyperopia defocus value (D)"; the distance from the center of eye rotation to the center of the lens is 27 The positions of the 10 reference points for refractive power compensation on the upper nasal side, temporal side, distance vision, and near vision of the lens are calculated in millimeters. See the second column of Table 3, "Lens Reference Point Position (mm)"; the reference points for each refractive power compensation Refer to the third column of Table 3, "Lens Power Compensation Value (D)". The front surface of the lens is a spherical surface with a power of 2.5D, and the power compensation is realized by adding an asymmetric toroidal correction sag on the spherical surface of the back surface with a spherical power of 6.5D and a cylindrical power of 2D in the optical axis direction of 20 degrees. , the refractive power distribution of the peripheral myopic defocus spectacle lens after the correction of the sag to realize the refractive power compensation is shown in Figure 12. Perform ray tracing and off-axis beamlet imaging formulas to obtain the distances from the retina of the images formed by objects in the central field of view and off-axis objects in the peripheral field of view as shown in Figure 13 and Figure 14. It can also be seen that the lens provided in this embodiment exhibits myopic defocus imaging. The distance from the retina to the image formed without prism compensation is listed in the fourth column of Table 3, "Defocus distance before prism compensation (mm)", and the distance from the retina to the image formed by the lens after prism compensation is listed in the fifth column of Table 3. listed in the column "Defocus distance after prism compensation (mm)".

table 3

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The peripheral myopic defocus spectacle lens provided by the invention has a spherical outer surface and an inner surface of its main design surface. The peripheral refractive power compensation and prism compensation are realized by correcting the sag of the inner surface of the lens, which is suitable for workshop processing. lens. The peripheral myopia defocus spectacle lens provided by the present invention makes the objects in the central field of view and the near-axis field of view are imaged in the fovea of the retina, and the off-axis objects far away from the central field of view are imaged in front of the retina, which can not only correct vision, but also Correct the peripheral hyperopic defocus to myopic defocus, restrain the eyeball from being elongated backwards, and control the deepening of myopia. The power compensation values in the four directions of the lens are different, which is in line with the ergonomic principle of reducing the defocus amount of the eyeball when the eye is used at close range, so that the myopic defocus image received by the peripheral retina is more uniform and symmetrical.

Claims (7)

1. a design method of an individualized peripheral myopia defocus spectacle lens, characterized in that the design of the inner surface of the lens comprises the steps: (1) The degree of emmetropia and the refractive power of the naked eye in each visual angle direction of the myopic patients were measured respectively. Each visual angle direction included 10 degrees, 20 degrees and 30 degrees on the nasal side of the naked eye, and 10 degrees, 20 degrees and 30 degrees on the temporal side. The distance of 10 degrees and 20 degrees of upper vision and the near vision of 10 degrees and 20 degrees of lower vision; the difference between the measured refractive power of each viewing angle direction and the patient's emmetropia refractive power is the peripheral hyperopic defocus value of myopic patients; (2) Determine the position of the intersection of the sight line and the lens in each viewing angle direction of the myopic patient, where the point corresponding to the near-sightedness of 10 degrees is deviated to the nasal side by 1 mm, and the point corresponding to the 20-degree angle of view is deviated to the nasal side by 2 mm. The obtained 10 position points are the reference points for the power compensation designed by the lens; (3) For each refractive power compensation reference point in step (2), take 105% to 120% of the peripheral hyperopic defocus value of the myopic patient corresponding to step (1) as the refractive power compensation value, and perform asymmetrical adjustment on the lens. Peripheral power compensation design to obtain the initial lens sag; (4) According to the spectacle frame parameters to be worn by myopic patients, the initial lens sag is corrected by setting additional prisms to obtain a personalized peripheral myopic defocus spectacle lens. 2. the design method of a kind of personalized peripheral myopia defocus spectacle lens according to claim 1, it is characterized in that: described spectacle frame parameter comprises the spectacle eye distance after the myopic patient wears spectacles, the spectacle frame vertical inclination angle , Horizontal tilt angle. 3. The method for designing a personalized peripheral myopic defocus spectacle lens according to claim 1, wherein the set additional prism has a vertical sagittal difference of 3 to 5.5 mm, and a horizontal sagittal difference of 3 to 5.5 mm. 2.2～4.5mm. 4. A kind of personalized peripheral myopia defocus spectacle lens obtained by the design method of claim 1. 5 . The personalized peripheral myopic defocusing spectacle lens according to claim 4 , wherein the center refractive power of the lens obtained according to the degree of emmetropia of myopic patients is -1.00D to -10.00D. 6 . 6 . The personalized peripheral myopic defocus spectacle lens according to claim 4 , wherein the outer surface of the lens is spherical. 7 . 7 . The method for preparing a personalized peripheral myopic defocus spectacle lens according to claim 4 , wherein the inner surface of the lens is processed in a workshop. 8 .

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