Spectacle Lens Peripheral Refractive Error Control
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Solution Overview
Problem
Existing spectacle lenses with micro convex portions for myopia progression suppression suffer from refractive power errors in the meridional and sagittal directions at the lens periphery, leading to impaired myopia or hyperopia progression suppression effects.
Innovation Solution
A spectacle lens design with a first area that converges light rays at a predetermined position A on the retina and multiple second areas that converge light rays at positions B or C, where the refractive power error in the peripheral area (4.5 mm to 25 mm from the lens center) is controlled to prevent focal position movement, ensuring effective myopia or hyperopia progression suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro convex portions are added to the spectacle lens for myopia progression suppression, then the myopia progression suppression effect is improved, but refractive power errors occur in the meridional and sagittal directions at the lens periphery
Solution Approach 1:
The patent applies local quality by differentiating the optical characteristics between the central region and peripheral region of the lens. The micro convex portions are strategically positioned in specific peripheral zones while maintaining different refractive power error tolerances between meridional and sagittal directions, allowing localized optimization of myopia suppression without compromising overall visual quality
Solution Approach 2:
The patent utilizes parameter changes by controlling refractive power errors within specific numerical ranges (meridional direction: -0.50D to +0.50D, sagittal direction: -0.75D to +0.75D). By adjusting these parameters and their relationships, the lens achieves effective myopia progression suppression while maintaining acceptable visual quality in the peripheral areas
2Manufacturing precision
If refractive power error is reduced in the peripheral area, then visual quality is improved, but the myopia progression suppression effect is weakened
Solution Approach 1:
The patent maintains different refractive power error characteristics in different directions (meridional vs. sagittal) at the lens periphery. This local differentiation allows the lens to preserve myopia suppression functionality in critical zones while maintaining acceptable visual quality, resolving the contradiction between error reduction and effectiveness
Solution Approach 2:
The patent defines specific parameter ranges for refractive power errors in meridional and sagittal directions, allowing controlled deviations that maintain both visual quality and myopia suppression effect. The asymmetric tolerance ranges (tighter in meridional, looser in sagittal) optimize the balance between these competing requirements
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 or hyperopia progression suppression effect in the peripheral area by managing refractive power errors, providing a clearer field of view and effective refractive power correction.
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 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
AI summary
An object is to not lose 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; and a plurality of 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, in the first area in a peripheral area of the spectacle lens that is a radius range from 4.5 mm to 25 mm of a lens center, a refractive power error in a meridional direction and a refractive power error in a sagittal direction have values that cause light rays to converge in a direction extending from a vicinity of the position A toward the position B if the second areas cause the light rays to converge at the position B, or have values that cause light rays to converge in a direction extending from the vicinity of the position A toward the position C if the second areas cause the light rays to converge at the position C.