3D Ophthalmic Lens Performance Evaluation Method
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Solution Overview
Problem
Current methods for evaluating ophthalmic lenses, particularly progressive addition lenses, do not effectively express performance in three dimensions, limiting visual comfort for presbyopic wearers by only considering multiple gaze directions at a single viewing distance.
Innovation Solution
A method using computer means to determine a three-dimensional performance of ophthalmic lenses by providing local optical criteria, threshold functions, and conditions, calculating a domain where these criteria meet threshold values, and determining the lens performance across various gaze directions and proximities, enhancing visual comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If lens performance is evaluated at multiple gaze directions but only at a single viewing distance, then the evaluation process remains simple, but the visual comfort for presbyopic wearers is limited
Solution Approach 1:
The patent transitions from two-dimensional evaluation (gaze directions only) to three-dimensional evaluation by adding the proximity dimension. This allows performance to be characterized across multiple gaze directions and multiple proximities, providing comprehensive visual comfort assessment for presbyopic wearers while maintaining systematic evaluation structure through domain calculation methods
2Ease of operation
If three-dimensional performance is determined across multiple gaze directions and proximities, then visual comfort is enhanced, but the calculation and evaluation process becomes more complex
Solution Approach 1:
The patent segments the performance evaluation into discrete components: local optical criteria are defined for specific points in 3D space, threshold functions are established for each criterion, and domains are calculated by combining these segmented elements. This segmentation allows complex three-dimensional performance to be measured and evaluated systematically through manageable steps rather than as a single complex measurement
Solution Approach 2:
The patent performs preliminary actions by pre-defining local optical criteria and their corresponding threshold functions before actual performance measurement. This preparation allows the complex three-dimensional performance evaluation to be conducted systematically through domain calculation, reducing the difficulty of measurement by establishing clear evaluation frameworks in advance
Data Source
AI summary
A method for determining a three dimensional performance of an ophthalmic lens including: calculating a domain in which a condition between a local optical criterion and at a threshold value is fulfilled; determining the three dimensional performance of the ophthalmic lens according to the domain. A method of calculating an ophthalmic lens includes the method.