Spectacle Lens Evaluation Using Physiological Astigmatism
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Solution Overview
Problem
Conventional methods for evaluating and designing spectacle lenses primarily focus on optical performances without adequately considering visual functions other than visual acuity, neglecting factors like physiological astigmatism and relative accommodation power, which are crucial for the wearer's experience.
Innovation Solution
A spectacle lens evaluation method that incorporates a visual acuity function including physiological astigmatism and relative accommodation power, using optimization calculations to design and manufacture lenses that optimize optical performance based on these factors, involving a networked system with a client-side and manufacturer-side computer for data input, calculation, and lens design output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical calculation methods are used to evaluate spectacle lenses, then optical performance can be obtained, but visual functions other than visual acuity (such as physiological astigmatism and relative accommodation power) are not adequately considered
Solution Approach 1:
The patent merges optical performance evaluation with visual function assessment by integrating multiple evaluation criteria including visual acuity, physiological astigmatism, and relative accommodation power into a unified evaluation framework. This combination allows comprehensive assessment of spectacle lens performance that considers both optical properties and human visual characteristics simultaneously.
Solution Approach 2:
The evaluation method is designed to be universal by accommodating multiple types of visual functions and optical performances through a single systematic approach. The method can evaluate different lens types (single vision, progressive, etc.) and various visual parameters using the same framework, making it adaptable to diverse spectacle lens evaluation needs.
2Manufacturing precision
If spectacle lenses are designed based solely on optical performance, then manufacturing precision can be maintained, but individual variations in accommodation power and visual comfort are not optimized
Solution Approach 1:
The patent applies local quality by optimizing different regions of the spectacle lens based on specific visual requirements. The evaluation method assesses optical performance at multiple locations across the lens surface, considering local variations in visual demands, accommodation power, and physiological astigmatism effects, thereby achieving both manufacturing precision and visual comfort.
Solution Approach 2:
The method utilizes parameter changes by adjusting lens design parameters based on individual visual function measurements. By varying optical parameters such as addition power, cylinder power, and axis orientation according to measured accommodation power and physiological astigmatism, the system optimizes both manufacturing specifications and wearer comfort.
3Device complexity
If conventional evaluation methods are used, then the evaluation process is simple, but the correlation between optical performance and actual visual function experience is insufficient
Solution Approach 1:
The patent implements feedback by using measured visual function data (accommodation power, physiological astigmatism) to adjust and refine lens design and evaluation criteria. The system continuously refines the evaluation process by incorporating actual visual performance measurements, thereby improving evaluation accuracy while maintaining a systematic approach.
Data Source
AI summary
More appropriate evaluation, design, and manufacture are made feasible by taking visual performances into consideration more appropriately. In order to achieve this object, in the present invention, spectacle lenses are evaluated using a visual acuity function including a factor representing physiological astigma. The physiological astigma herein means astigma in the phenomenon that an improved visual acuity is yielded when slight astigma is present in the region where the accommodation power is lower than the region indicating the range of positive relative accommodation power in which the accommodation power increases among the relative accommodation power as adaptable accommodation power in a state that convergence does not change.