Spectacle Lens Optimization via Eye Coordinate Transformation
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Solution Overview
Problem
Existing methods for optimizing spectacle lenses based on wavefront calculations at the vertex sphere do not provide suitable target specifications and weightings, leading to inconsistent designs and inadequate perception improvements when viewed through the lenses.
Innovation Solution
A computer-implemented method that calculates and assesses spectacle lenses by associating imaging properties with vision models, using a target function that accounts for vision quality and aberrations at various evaluation surfaces within the eye, incorporating existing vision models and transforming target specifications and weights for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wavefront calculations are performed at the vertex sphere using prior art methods, then optimization can be conducted with existing target specifications, but the resulting lens designs are inconsistent and do not improve perception when viewed through the spectacles
Solution Approach 1:
The patent introduces an intermediary transformation process that converts target specifications and weightings from the vertex sphere coordinate system to the eye coordinate system. This intermediary step (transforming via the optical system of the eye) ensures that optimizations performed at the vertex sphere actually translate to improved perception in the eye, resolving the contradiction between measurement precision and reliability of perception improvement.
Solution Approach 2:
The patent replaces the direct optimization approach at the vertex sphere with a transformed optimization approach that uses vision models and coordinate transformations. Instead of directly optimizing wavefront parameters at the vertex sphere, the system transforms these into equivalent parameters in the eye coordinate system, substituting the mechanical optimization process with a model-based transformation process that ensures perceptual relevance.
2Reliability
If new target specifications and weightings are developed for wavefront optimization in the eye, then perception improvement may be achieved, but extensive testing and new knowledge acquisition are required
Solution Approach 1:
The patent creates a universal transformation framework that can handle any target specification and weighting combination from the vertex sphere coordinate system and automatically convert it to the eye coordinate system. This universal approach eliminates the need for extensive testing and new knowledge acquisition for each optimization case, as the transformation rules consistently translate any vertex sphere optimization parameters into their eye-equivalent counterparts.
Solution Approach 2:
The patent performs preliminary establishment of the transformation rules and vision models before actual lens optimization. By pre-defining the coordinate transformation relationships and vision model parameters, the system prepares the framework in advance, so that subsequent optimizations can directly use these pre-established relationships without requiring extensive testing or new knowledge acquisition for each case.
3Ease of manufacture
If wavefront evaluation is performed at the vertex sphere, then calculation is simplified, but the optimization does not account for individual eye properties such as cornea and anterior chamber depth deviations
Solution Approach 1:
The patent applies local quality by transforming the global vertex sphere coordinate system into the local eye coordinate system that accounts for individual eye properties. The transformation incorporates local variations in corneal shape, anterior chamber depth, and other individual eye characteristics, allowing the optimization to be performed with simplified vertex sphere calculations while still achieving local adaptation to individual eye properties through the coordinate transformation.
Data Source
AI summary
A computer-implemented method for calculating or assessing a spectacles lens for an eye of a spectacles wearer. The method includes (a) providing an association of at least one imaging property or aberration of a spectacle lens system with the vision of the spectacles wearer, or of an average spectacles wearer, when observing an object through the spectacles lens system; (b) determining or prescribing a target function for the spectacles lens to be calculated or assessed, in which the association from step (a) is to be evaluated; and (c) calculating or assessing the spectacles lens to be calculated or assessed by evaluating the target function, wherein the target function is evaluated at least once.