Eyeglass Lens Evaluation Using Ray Tracing for Multiple Convex Portions
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Solution Overview
Problem
Conventional methods, such as lens meters and wavefront sensors, are inadequate for evaluating eyeglass lenses with multiple convex portions due to the difficulty in identifying focal positions.
Innovation Solution
A method using ray tracing to evaluate the performance of eyeglass lenses with multiple convex portions by determining the number of rays converging at focal positions and calculating defocus power within specific evaluation regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional lens meters or wavefront sensors are used to evaluate eyeglass lenses, then measurement capability is available for standard lenses, but measurement is impossible or extremely difficult for lenses with multiple convex portions due to inability to identify focal positions
Solution Approach 1:
The patent creates a ray tracing model that copies the optical structure of the eyeglass lens with multiple convex portions. By simulating ray propagation through the lens using computational ray tracing, the system can identify focal positions and evaluate optical performance without requiring physical measurement devices to directly locate the difficult-to-access focal points of minute convex portions.
2Reliability
If minute convex portions with diameter of about 1 mm are formed on the eyeglass lens for myopia control, then defocus power is provided to suppress myopia progression, but focal positions become impossible or extremely difficult to find using conventional measurement devices
Solution Approach 1:
The patent replaces mechanical measurement systems (lens meters, wavefront sensors) with a computational ray tracing system. By using optical simulation and mathematical modeling to trace light rays through the lens, the system can precisely determine focal positions and optical performance metrics without relying on physical measurement devices that struggle with the small scale and multiple focal points of the convex portions.
3Measurement precision
If ray tracing is performed on the eyeglass lens to evaluate focal positions, then accurate evaluation of multiple focal positions A is enabled, but computational complexity increases compared to conventional measurement methods
Solution Approach 1:
The patent develops a universal ray tracing evaluation system that can handle various types of eyeglass lenses with different configurations of convex portions. The computational model is designed to be adaptable to different lens designs, evaluation regions, and focal position distributions, making it a multi-functional tool that replaces multiple specialized measurement devices while providing comprehensive optical performance evaluation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective evaluation of eyeglass lenses with multiple convex portions by specifying focal positions and assessing performance based on ray convergence and stray light ratios, ensuring accurate myopia progression control.
Implementation Method 1
light that has passed through minute convex portions enters the eyeglass lens, and the rays are focused at a plurality of positions A on the object side relative to the predetermined position B
Data Source
AI summary
Provided is a method for evaluating an eyeglass lens that has a plurality of convex portions on at least one of an object-side surface and an eyeball-side surface, in which the eyeglass lens is evaluated based on the number of rays at a plurality of focal positions A at which rays, which pave passed through the plurality of convex portions in a predetermined evaluation region of the eyeglass lens, converge when ray tracing is performed on the predetermined evaluation region, and technology related thereto.