Spectacle Lens Non-Uniform Dot Contrast Adjustment
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Solution Overview
Problem
Spectacle lenses with isotropically arranged dot patterns suffer from direction-dependent contrast reduction effects in peripheral areas, leading to uncomfortable feelings and stray light generation.
Innovation Solution
A spectacle lens design featuring a contrast adjustment section with non-uniformly arranged dot portions, where the dot portions in the central area are isotropically arranged and those in the surrounding area have longer diametrical lengths and inclined shapes to prevent direction-dependent contrast variations and stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dot portions are arranged isotropically and uniformly across the entire lens surface, then the contrast reduction effect is achieved mainly in the low spatial frequency range, but a direction-dependent difference in contrast reduction effect occurs in peripheral areas and stray light is generated
Solution Approach 1:
The patent divides the lens surface into a central area and a surrounding area, applying different dot portion arrangement patterns to each region. The central area uses an isotropic pattern for contrast reduction, while the surrounding area uses a non-uniform pattern to prevent direction-dependent effects and stray light, thereby achieving local optimization of optical properties.
Solution Approach 2:
The patent introduces asymmetric arrangement of dot portions in the surrounding area, where the arrangement differs from the isotropic central area. This asymmetric design specifically addresses the direction-dependent contrast reduction problem by creating a pattern that compensates for oblique light flux effects in peripheral regions.
2Ease of manufacture
If dot portions are arranged uniformly across the lens surface, then the lens structure is simple and easy to manufacture, but direction-dependent contrast reduction effects occur in peripheral areas causing user discomfort
Solution Approach 1:
The patent maintains simple isotropic arrangement in the central area where uniform manufacturing is easiest, while introducing non-uniform arrangement only in the surrounding area where direction-dependent effects occur. This localized approach improves user comfort without significantly complicating the overall manufacturing process.
3Measurement precision
If isotropic dot pattern is used across the entire lens, then contrast reduction is achieved, but stray light is likely to be generated in peripheral areas
Solution Approach 1:
The patent extracts the problematic isotropic dot pattern from the surrounding area and replaces it with a non-uniform arrangement pattern. This removes the source of stray light generation in peripheral regions while preserving the beneficial contrast reduction effect in the central area through the retained isotropic pattern.
Data Source
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AI summary
A spectacle lens according to the first embodiment of the present disclosure includes: a lens body; and a contrast adjustment section provided on or in the lens body and including a dot-portion group in which dot portions are arranged, wherein the arrangement of the dot portions is non-uniform. A spectacle lens according to the second embodiment of the present disclosure includes: a lens body; and a contrast adjustment section provided on or in the lens body and including a dot-portion group in which dot portions are arranged, wherein the dot-portion group includes dot portions each having an aspect ratio, which is the ratio of the length in the short-axis direction to the length in the long-axis direction in the plan-view shape, of less than 1.