Spectacle Lens Design Using Wavefront Tracing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for designing and fabricating spectacle lenses, particularly those with aspherical or progressive surfaces, are time-consuming due to the use of ray tracing, which is inefficient for optimizing lenses online and meeting individual wearer needs.
Innovation Solution
A method that involves obtaining user data, specifying a draft design with evaluation points, determining main rays and local wavefronts, and optimizing the lens design using a sparse Jacobian matrix and wavefront tracing to minimize target functions for aberrations, allowing for faster and more precise lens fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ray tracing is used to calculate and optimize spectacle lens surfaces, then imaging properties can be accurately evaluated, but calculating time becomes excessively long
Solution Approach 1:
The patent segments the wavefront into multiple local zones, each evaluated independently using local wavefront tracing. This divides the complex global ray tracing problem into smaller, computationally efficient local calculations while maintaining overall accuracy for optimization purposes.
Solution Approach 2:
The patent replaces the traditional mechanical ray tracing method with a wavefront-based computational approach. By using wavefront tracing and local surface curvature calculations instead of iterative ray tracing, the system achieves comparable accuracy with significantly reduced computing time.
2Reliability
If traditional optimization methods are used for individual spectacle lenses, then optical quality can be ensured, but online optimization on receipt of order is not feasible
Solution Approach 1:
The patent uses preliminary local wavefront calculations and surface curvature evaluations to predict optical performance before finalizing the lens design. This preliminary assessment enables rapid online optimization by identifying key parameters that need adjustment without requiring exhaustive iterative calculations.
Solution Approach 2:
The patent optimizes lens parameters (surface curvatures, aspheric coefficients) by making targeted changes based on local wavefront analysis. This parameter-based optimization approach allows for rapid convergence to an optimal design that maintains optical quality while enabling online processing.
Data Source
AI summary
The invention relates to a method, a computer program product and a system for designing or producing a spectacle lens for a spectacle wearer. Said method consists of the following steps: individual user data or application data of the spectacle wearer is obtained; the design concept for the spectacle lens having a plurality of evaluation points is determined; a main beam path through the plurality of evaluation points is determined; a local wavefront is specified for each of the main beams in the surroundings of the respective main beam; optical properties of the spectacle lens are determined on the evaluation points by determining an influence of the spectacle lens on the local wavefronts in the surroundings of the respective evaluation point; and the design concept is evaluated in accordance with the determined optical properties and the individual user data.