CN-121995652-A - Progressive addition lens for controlling eye axis growth

Abstract

The invention discloses a progressive addition lens for controlling eye axis growth, which comprises a far zone, a progressive channel and a near zone which are sequentially arranged along the up-down direction. At least the peripheral area of the lens body is processed by laser to form a plurality of optical scattering microstructure points, and the microstructure points are uniformly distributed on the surface of the lens in an equiangular spiral manner according to the Fermat spiral distribution rule, so that multi-level and multi-directional optical scattering is formed in the peripheral retina area of a wearer, the peripheral imaging contrast is reduced, the excessive growth of the eye axis is restrained, and meanwhile, the central vision is kept clear. The invention can be used in the field of teenager myopia prevention and control.

Inventors

• WANG YANG
• ZHOU YICHENG
• FENG SHENGYUAN
• XU JING
• SHI YUTONG
• LI ZHONG

Assignees

• 懂视星球(深圳)视光科技有限公司

Dates

Publication Date

20260508

Application Date

20260226

Claims (10)

1. 1. The progressive addition lens for controlling the eye axis to grow comprises a lens body and is characterized in that the lens body is provided with a far zone, a progressive channel and a near zone which are sequentially arranged along the up-down direction; At least the peripheral area of the lens body is processed by laser to form a plurality of optical scattering microstructure points, and the optical scattering microstructure points are uniformly distributed on the surface of the lens in an equiangular spiral manner according to the Fermat spiral distribution rule, so that the peripheral retina area of a wearer can obtain multi-level and multi-directional optical scattering.
2. 2. The progressive addition lens of claim 1, wherein the optically scattering microstructure points are any one or a combination of laser formed micro-holes, micro-pits, or micro-bumps.
3. 3. The progressive addition lens of claim 1, wherein at least one of the aperture, depth or height of the optically scattering microstructure point is controllably varied according to its position in the Fermat's spiral path to adjust the intensity of scattered light in the region.
4. 4. The progressive addition lens of claim 1, wherein the optical scattering microstructure dots have a higher density in a peripheral area of the lens than in a central area of the lens such that the contrast reducing effect acts primarily on the peripheral retina of the wearer.
5. 5. The progressive addition lens of claim 1, wherein the optically scattering microstructure points are disposed in at least a portion of the peripheral areas of the distance zone and the near zone, and the progressive channel region remains free of microstructure points.
6. 6. The progressive addition lens of claim 1, wherein the sidewall cross-sectional shape of the optically scattering microstructure point is asymmetric to form a scattered light field having directionality.
7. 7. The progressive addition lens of claim 1, wherein the total number of points, the number of arms, or the initial angle of the Fermat's spiral microstructure points is personalized based on the wearer's age, diopter or AC/A value.
8. 8. The progressive addition lens of claim 1, wherein the optical scattering microstructure points are configured to simulate light scattering characteristics of an outdoor low contrast visual environment to slow down eye axis growth.
9. 9. The progressive addition lens of claim 1, wherein the optical scattering microstructure dots are formed by femtosecond laser, nanosecond laser or short pulse laser processing, and a preset Fermat spiral lattice is obtained by single forming or multiple scanning.
10. 10. The progressive addition lens of claim 1, wherein the lens body is made of a resin material, an optical glass, a polycarbonate or a high refractive index optical material, and is surface-coated to maintain optical stability of the microstructure lattice.

Description

Progressive addition lens for controlling eye axis growth Technical Field The present invention relates to lenses, and in particular to progressive addition lenses for controlling the growth of the eye axis. Background The incidence of myopia in the global teenagers continues to rise, with rapid eye axis growth being considered the primary biological mechanism that leads to an ever-increasing degree of myopia in teenagers. A large number of researches show that factors such as relative defocus of central clear imaging and peripheral retina, imaging contrast, scattering characteristics, vision adjustment load and the like can influence the growth speed of an eye axis. Therefore, improving the imaging state of the peripheral retina by optical means is an important research direction in the field of myopia prevention and control at present. Progressive addition lenses are widely used in the art to correct wearers who have both distance and near vision requirements. The lenses are usually provided with a far zone, a progressive channel and a near zone on the same lens in series, and the aim of reducing the adjustment load and the collective pressure is achieved by changing the luminosity of different areas of the lens, and are commonly used for teenager myopia groups with lag adjustment, cramping adjustment, high AC/A ratio and implicit inclination. However, conventional progressive addition lenses are mainly used for improving binocular vision, and have limited inhibition of the increase of the eye axis, and cannot effectively form optical interventions on the peripheral retina. On the other hand, technologies for controlling eye axis growth by changing peripheral imaging characteristics, increasing defocus, adjusting contrast, or introducing a scattered light field, such as lenses employing defocus rings, zonal positive optical power regions, or microlens arrays, have also emerged in existing myopia prevention and control optical products. Although these structures can change the peripheral imaging to some extent, the following drawbacks are prevalent: (1) The structure is solidified and the adjustability is poor, so that parameter optimization is difficult to carry out according to visual characteristics of different wearers; (2) The optical structure is easy to generate interference in the center of the lens, so that the clear vision in the center is affected; (3) The scattering or defocusing mode is single, a multi-level and multi-directional low-contrast visual environment cannot be formed on the periphery, and the regulation effect of an outdoor natural scattering light field on the growth of an eye axis cannot be simulated; (4) The existing scattering points or micropore arrays mostly adopt the modes of regular matrixes, annular distribution points and the like, are uneven in arrangement and insufficient in directivity, and are difficult to obtain a highly uniform scattering effect. In addition, in the conventional processing technology, it is difficult to form a microstructure array with a large area, high density and gradual change rule on the surface of the lens. Even if the microstructure can be formed, the distribution mode often lacks mathematical rule support, so that the scattering effect is unpredictable, the light field consistency is poor, and the optical performance, the transparency and the aesthetic property of the lens are difficult to be considered. In summary, the prior art is lacking in a lens that is capable of forming a continuous uniform, multi-directional scattered light field in the peripheral region of the lens, while being compatible with progressive addition structures and maintaining clear central vision. In particular, a solution combining progressive addition lens designs with a mathematically regular fischer helical lattice optical scattering structure has not been provided in the prior art. The Fermat spiral (FERMAT SPIRAL) has natural equiangular uniform distribution characteristics, so that the microstructure points can be distributed in a highly uniform gradual change mode on the surface of the lens, thereby realizing a surrounding low-contrast environment which is more natural and more similar to an outdoor light field, but no technical disclosure related to the application of the micro-structure points to the progressive multi-focus lens is seen at present. Disclosure of Invention In order to solve the problems, the invention provides a progressive addition lens for controlling the eye axis growth, which reduces the imaging contrast of peripheral retina by introducing an optical scattering microstructure lattice following the Fermat spiral distribution rule into the peripheral area of the lens, thereby effectively controlling the eye axis growth on the premise of keeping clear central vision and making up for the defects of the existing optical myopia prevention and control scheme. The invention is realized by the following technical scheme that the progressive additi