Segmented Spectacle Lens for Myopia Control and Visibility
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Solution Overview
Problem
Conventional spectacle lenses, such as concentric Fresnel multifocus lenses, face challenges when used as spectacles due to issues with image formation and visibility when the visual line passes through positions away from the lens center, leading to double vision and discomfort.
Innovation Solution
A spectacle lens design featuring a first refraction area for focusing images on the retina and second independent island-shaped refraction areas with different refractive powers, strategically positioned around the center to suppress abnormal refractions like myopia and hyperopia, ensuring proper image formation and visibility while allowing eye movement without discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional concentric Fresnel multifocus lenses are used, then the function of suppressing abnormal refraction progression is achieved, but image formation and visibility deteriorate when the visual line passes through positions away from the lens center, causing double vision and discomfort
Solution Approach 1:
The lens is divided into multiple independent refraction areas (first refraction area with first refractive power, second refraction areas with second refractive power) instead of using a uniform concentric Fresnel structure. This segmentation allows different regions to serve different functions: the first refraction area provides clear central vision, while the second refraction areas provide peripheral vision and suppress abnormal refraction progression without causing double vision.
Solution Approach 2:
Different refraction areas are assigned different refractive powers based on their specific functions. The first refraction area has a first refractive power optimized for central clear vision, while the second refraction areas have a second refractive power optimized for suppressing abnormal refraction progression in the periphery. This local differentiation ensures that each area performs its specific function optimally without interfering with other areas.
2Reliability
If the lens has multiple refraction areas with different refractive powers, then the function of suppressing abnormal refraction is improved, but the lens structure becomes more complex
Solution Approach 1:
The lens is divided into multiple independent refraction areas (first refraction area with first refractive power, second refraction areas with second refractive power) instead of using a uniform concentric Fresnel structure. This segmentation allows different regions to serve different functions: the first refraction area provides clear central vision, while the second refraction areas provide peripheral vision and suppress abnormal refraction progression without causing double vision.
Solution Approach 2:
The lens structure integrates multiple functions into a single device: the first refraction area provides clear central vision correction, while the second refraction areas simultaneously provide peripheral vision and suppress abnormal refraction progression. This multi-functionality is achieved within a unified lens structure rather than requiring multiple separate components.
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 effectively suppresses the progression of abnormal refractions while maintaining sufficient visibility and a comfortable wearing experience by ensuring images are focused correctly on the retina or in front of it, depending on the refractive power, and allowing clear object recognition even when the eye moves.
Implementation Method 1
a first refraction area having a first refractive power based on a prescription for correcting an abnormal refraction (e.g., ametropia) of an eye
Implementation Method 2
second refraction areas having a refractive power different from the first refractive power, and having a function of focusing an image on a position other than a retina of the eye so as to suppress a progress of the abnormal refraction
Data Source
AI summary
A spectacle lens can inhibit ametropia of the eyes and ensure full visibility. The spectacle lens comprises: first refraction areas and second refraction areas. Each first refraction area has a first refraction force that may be based on a prescription for correcting the ametropia of the eyes. Each second refraction area has a refraction force different from the first refraction force and may function to focus images on the positions except the retina of the eyes, to inhibit the development of the ametropia. Near the central part of the lens, the second refraction areas form a plurality of independent island-shaped areas, and the first refraction areas form the areas beyond the areas of the second refraction areas.