Spectacle Lens Microlens Layout for Peripheral Myopia Defocus
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Solution Overview
Problem
Conventional spectacle lenses that aim to slow down myopia progression often cause visual distortions and discomfort due to continuous changes in refractive power, leading to astigmatism and blurred vision, and existing peripheral discrete lenses fail to provide a blurred image, and they are not designed to prevent further deterioration of vision.
Innovation Solution
A spectacle lens design featuring an optical zone with a central optical zone and a functional zone comprising a plurality of functional sub-elements, where each sub-element includes a first lens and multiple second lenses with different refractive powers, arranged to form a uniform diffusion circle, ensuring clear central vision while creating a blurred peripheral image to inhibit myopia progression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If peripheral continuous defocus lens is used to slow down myopia progression, then myopia progression is inhibited, but visual distortion and deformation occur causing discomfort
Solution Approach 1:
The patent divides the peripheral zone into multiple discrete functional elements (first functional elements and second functional elements) instead of using continuous defocus. Each functional element contains multiple microlenses arranged in specific patterns, creating segmented defocus regions that reduce visual distortion while maintaining myopia control effectiveness.
Solution Approach 2:
Different functional elements are designed with different properties: first functional elements have microlenses with positive optical power positioned at specific locations to create controlled defocus, while second functional elements have different microlens arrangements. This local differentiation allows the lens to provide myopia control in peripheral zones without causing uniform visual distortion across the entire field of view.
2Reliability
If peripheral discrete multi-point defocus design is used, then myopia progression is inhibited, but area filling rate is limited preventing deep modulation of imaging quality
Solution Approach 1:
Each functional element contains multiple microlenses nested within a defined geometric pattern (e.g., hexagonal or circular arrangements). The microlenses are positioned at specific radial distances and angular intervals, creating a nested structure where smaller optical elements are organized within larger functional zones, maximizing the area filling rate while maintaining effective defocus modulation.
Solution Approach 2:
The patent introduces angular positioning as an additional dimension for microlens arrangement, specifying both radial distance and angular interval for each microlens within functional elements. This two-dimensional arrangement (radial + angular) allows denser packing of microlenses compared to simple radial arrangements, increasing area filling rate and enhancing imaging quality modulation capability.
3Reliability
If peripheral discrete lens is used, then myopia progression is inhibited, but double images appear on retina causing eye accommodation disorders
Solution Approach 1:
The patent extracts and eliminates the harmful double image effect by carefully designing the optical power and positioning of microlenses within functional elements. The microlenses are positioned and sized to create defocus without forming separate image planes, removing the problematic double image phenomenon while preserving the beneficial myopia control effect.
Solution Approach 2:
The patent optimizes key parameters including microlens optical power, radial position, angular interval, and diameter to achieve the desired effect. By adjusting these parameters, the lens creates controlled defocus in peripheral zones that inhibits myopia progression without generating double images, as the parameters are tuned to avoid forming distinct secondary image planes on the retina.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lens design provides clear central vision and prevents further deterioration by forming a blurred peripheral image, reducing eye strain and maintaining optimal imaging quality without causing double images.
Implementation Method 1
Each of the functional sub-elements includes a first lens located in a central position of functional the sub-element and a plurality of second lenses around the first lens. The first lens and the second lenses have different refractive powers.
Data Source
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AI summary
A spectacle lens includes an optical zone (10) and a functional zone (20). The optical zone (10) can play a corrective role for vision of a patient with an ametropia. The optical zone (10) forms a base surface (S) of the spectacle lens (1) and has a refractive power according to an eyeball prescription. The functional zone (20) surrounds a central optical zone (11) of the spectacle lens (1) and includes a plurality of functional sub-elements (U) fitting with one another. Each of the functional sub-elements (U) includes a first lens (21) located in a central position and a plurality of second lenses (22) around the first lens. Each of the second lenses (22) has a surface shape of a regular polygon, the respective second lenses of at least a part of the plurality of functional sub-elements are in surface contact with one another via a surface where sides of the regular polygons are located, and the plurality of functional sub-elements (U) are configured such that wavefronts formed thereby can be superimposed on a working focal plane of the optical zone (10) to form a uniform dufussion circle that can form a blurred peripheral vision image. The spectacle lens (1) can perform deep modulation for the imaging quality of the image plane on the retina