Progressive Lens Performance Factor Calculation
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Solution Overview
Problem
Existing methods for evaluating the performance of progressive lenses are inefficient and require full calculation of lens surfaces, which is time-consuming and not practical for rapid assessment based on individual parameters.
Innovation Solution
A computer-assisted method for evaluating the performance of progressive lenses by determining individual parameters such as prescription and wearer data, calculating a total performance factor for different quality classes, and displaying the results without the need for surface calculations, using polynomial functions to correlate these parameters with visual acuity and visual impression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If full calculation of lens surfaces is performed, then measurement precision of lens performance is improved, but loss of time increases
Solution Approach 1:
The patent extracts and utilizes only the essential individual parameters (spherical power, astigmatic power, axis direction, prism, frame inclination, vertex distance, and pupillary distance) from the complete lens surface calculation process. By calculating performance factors based on these extracted parameters rather than performing full surface calculations, the method achieves rapid evaluation while maintaining sufficient accuracy for practical decision-making.
Solution Approach 2:
The patent changes the evaluation approach from geometric surface calculation to parameter-based factor calculation. Individual parameters are converted into performance factors through mathematical relationships, allowing rapid assessment of lens quality classes without time-consuming surface geometry computations.
2Adaptability or versatility
If individual parameters are customized for each wearer, then adaptability of lens performance is improved, but device complexity increases
Solution Approach 1:
The patent segments the lens performance evaluation into multiple independent quality aspects, each represented by a separate performance factor (P1 for spherical power, P2 for astigmatic power, P3 for axis direction, P4 for prism, P5 for frame inclination, P6 for vertex distance, and P7 for pupillary distance). This segmentation allows systematic customization while maintaining computational simplicity through modular factor multiplication.
Solution Approach 2:
The patent creates a universal evaluation framework that handles multiple lens parameters and quality classes through a single integrated formula (P = P1 × P2 × P3 × P4 × P5 × P6 × P7). This multi-functional approach accommodates various customization scenarios without requiring separate evaluation systems for different parameter combinations.
Data Source
AI summary
The invention relates to a method for computer-assisted evaluation of the performance of progressive lenses, specifically while taking into account individual parameters of a given eyeglass wearer, the individual parameters including at least personal prescription data, in particular, additional spherical, astigmatic, and/or prismatic power, and/or personal wearer data for the eyeglass wearer, in particular, forward inclination, horizontal frame inclination, corneal vertex distance, and/or interpupillary distance. The method includes the following steps: determining the individual parameters; calculating a total performance factor P in each case for at least two quality classes of progressive lenses as a function of the individual parameters, the total performance factor P being correlated with the quality of the monocular visual acuity and/or binocular visual impression; and outputting the calculated total performance factor P for the quality classes.