Spectacle Lens Evaluation Using Prism Change Rates for Distortion
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Solution Overview
Problem
Existing methods and devices for evaluating progressive multifocal lenses fail to provide a numerical assessment of distortion and shaking, preventing quantitative comparison and evaluation of these optical performance aspects.
Innovation Solution
A performance evaluation method and computer-readable storage medium that calculate distortion and shaking evaluation values using formulas based on prism refractive index components, allowing for quantitative assessment through a computer system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods and devices are used to evaluate progressive multifocal lenses, then visual field images can be obtained, but quantitative expression and comparison of distortion and shaking performance cannot be achieved
Solution Approach 1:
The patent transforms the evaluation from qualitative visual field imaging to quantitative measurement by calculating specific parameters (distortion evaluation value and shaking evaluation value) based on prism refractive index components. This parameter-based approach enables numerical comparison and precise assessment of lens performance.
Solution Approach 2:
The patent replaces the mechanical/optical visualization system with a computational mathematical model. By using formulas that calculate evaluation values from prism refractive index data, the system substitutes physical measurement equipment with computer-based calculations, achieving quantitative results without complex measurement apparatus.
2Loss of information
If visual field experience devices are used, then distortion aberration can be experienced visually, but numerical expression of distortion and shaking performance is not possible
Solution Approach 1:
The patent extracts the essential evaluation information (distortion and shaking characteristics) from the complex visual field experience device by calculating specific evaluation values from prism refractive index components. This extraction process isolates the key performance metrics without requiring the entire visual field experience system.
Solution Approach 2:
The patent creates a computational model that copies the essential evaluation function from the physical visual field experience device. By formulating mathematical expressions that replicate the distortion and shaking evaluation capabilities, the system achieves numerical expression without needing the complex physical device.
3Manufacturing precision
If prism refractive index components are used for calculation, then quantitative distortion and shaking evaluation values can be obtained, but the evaluation method requires new computational formulas and approaches
Solution Approach 1:
The patent segments the evaluation process into distinct computational steps: calculating the first component (horizontal prism refractive index change rate), calculating the second component (vertical prism refractive index change rate), and combining these to obtain distortion and shaking evaluation values. This segmentation makes the complex evaluation method systematically implementable.
Solution Approach 2:
The patent performs preliminary calculations of the prism refractive index components before computing the final evaluation values. By pre-calculating the first and second components from the lens design data, the system prepares the necessary inputs that simplify the subsequent evaluation steps and improve computational efficiency.
Data Source
AI summary
A performance evaluation method for a spectacle lens comprising calculating a change rate of a first component and a change rate of a second component with a computer to calculate at least one of a distortion evaluation value and a shaking evaluation value, the first component being a component in a first direction of a prism refractive index, the second component being a component in a second direction of the prism refractive index, the distortion evaluation value being a value for evaluating a distortion regarding a spectacle lens, the shaking evaluation value being a value for evaluating a shaking regarding the spectacle lens.