Spectacle Lens Defocus Structure for Peripheral Astigmatism Control
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Solution Overview
Problem
Existing spectacle lenses with micro convex portions for myopia suppression suffer from refractive power errors and astigmatism in peripheral areas, leading to variations in defocusing effects and potential impairment of myopia progression-suppressive effects.
Innovation Solution
The spectacle lens design includes second areas with varying refractive power and toric shapes in the peripheral region to maintain consistent defocusing power and cancel out astigmatism, ensuring the myopia progression-suppressive effect is not impaired.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro convex portions are added to suppress myopia progression, then myopia progression-suppressive effect is improved, but refractive power errors and astigmatism occur in peripheral areas
Solution Approach 1:
The patent applies different shapes to micro convex portions based on their location: circular shape in the central area and toric shape in the peripheral area. This local differentiation allows the lens to maintain consistent defocusing power while compensating for location-specific optical aberrations, thereby resolving the contradiction between achieving myopia suppression and avoiding refractive power errors.
Solution Approach 2:
The patent changes the geometric parameters of micro convex portions by introducing toric shapes in peripheral areas with different curvature radii in meridional and sagittal directions. This parameter modification compensates for astigmatism and refractive power errors that occur in peripheral regions, maintaining optical precision while preserving the myopia progression-suppressive effect.
2Reliability
If micro convex portions are added to suppress myopia progression, then myopia progression-suppressive effect is improved, but astigmatism occurs in peripheral areas
Solution Approach 1:
The patent applies different shapes to micro convex portions based on their location: circular shape in the central area and toric shape in the peripheral area. This local differentiation allows the lens to maintain consistent defocusing power while compensating for location-specific optical aberrations, thereby resolving the contradiction between achieving myopia suppression and avoiding refractive power errors.
Solution Approach 2:
The patent changes the geometric parameters of micro convex portions by introducing toric shapes in peripheral areas with different curvature radii in meridional and sagittal directions. This parameter modification compensates for astigmatism and refractive power errors that occur in peripheral regions, maintaining optical precision while preserving the myopia progression-suppressive effect.
3Reliability
If defocusing power is increased in peripheral areas, then myopia progression-suppressive effect is improved, but variation in defocusing effect increases
Solution Approach 1:
The patent applies different shapes to micro convex portions based on their location: circular shape in the central area and toric shape in the peripheral area. This local differentiation allows the lens to maintain consistent defocusing power while compensating for location-specific optical aberrations, thereby resolving the contradiction between achieving myopia suppression and avoiding refractive power errors.
Solution Approach 2:
The patent uses optical simulation and calculation to predict and adjust the defocusing power of micro convex portions in different areas. By iteratively optimizing the shape parameters based on simulated optical performance, the design achieves consistent defocusing effects across the lens while maintaining the myopia progression-suppressive effect.
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 design maintains the myopia progression-suppressive effect by reducing refractive power errors and astigmatism in the peripheral areas, providing a consistent focal point and enhancing the reliability of the myopia suppression.
Implementation Method 1
parallel rays that are incident on the object-side face of the lens exit from the eyeball-side face of the lens and are focused on the retina
Implementation Method 2
a plurality of defocusing second areas configured to cause light rays to converge at a position B on the object side or a position C on the distal side relative to the position A
Data Source
Figure 1
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AI summary
An aspect is to not impair an effect of suppressing the progression of myopia or hyperopia even in a peripheral area of a spectacle lens. A spectacle lens and a technology related thereto are provided, the spectacle lens including: a first area that causes light rays incident on an object-side face of the lens to exit from an eyeball -side face of the lens and to converge at a predetermined position A on a retina of a wearer; a plurality of defocusing second areas configured to cause light rays to converge at a position B on the object side or a position C on the distal side relative to the position A, wherein at least some of the second areas in a peripheral area of the spectacle lens that is a radius range from 4.5 mm to 25 mm from a lens center have a shape that suppresses a variation in a defocusing effect, the variation being more likely to occur as a distance from the lens center increases.