Ophthalmic Lens Difference Determination Using Stimulus Space
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Solution Overview
Problem
It is challenging for visual health professionals and wearers to determine if personalized ophthalmic lenses are sufficiently different from non-personalized lenses, as existing methods lack a simple technique to assess the perceptible differences, and measurement inaccuracies can lead to varying results.
Innovation Solution
A system and method that determine the level of difference between ophthalmic lenses using comparison parameters, which involve acquiring and processing design and definition parameters to associate them with a stimulus space, allowing users to discern differences based on sensory thresholds, and adjusting for individual sensitivity and measurement inaccuracies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ophthalmic lenses are customized based on measurement of design parameters, then the lenses can be personalized to wearer needs, but measurement errors cause inconsistent results between successive measurements
Solution Approach 1:
The system provides feedback to the practitioner about the level of difference between lenses determined from successive measurements. By calculating and displaying comparison parameters that indicate whether differences exceed perception thresholds, the system enables practitioners to identify when measurement variations are significant, allowing them to take corrective actions such as remeasuring or adjusting the determination process.
Solution Approach 2:
The system transforms design parameters into comparison parameters that are scaled to perceptual thresholds. By changing the parameter representation from raw measurement values to normalized comparison values that account for human perception limits, the system distinguishes between meaningful variations and measurement noise, resolving the inconsistency problem.
2Reliability
If traditional optical performance methods are used to compare lenses, then optical properties can be analyzed, but the methods are complex and do not provide simple determination of perceptible differences
Solution Approach 1:
The system extracts only the essential comparison parameters from full optical analysis that are relevant to human perception. Instead of analyzing all optical properties, it focuses on specific parameters (such as magnification, distortion, or other vision-critical properties) and compares them against perception thresholds, simplifying the complex optical analysis into actionable comparison results.
Solution Approach 2:
The system visualizes comparison results using color-coded indicators that immediately show whether differences exceed perception thresholds. By translating complex numerical comparisons into intuitive visual signals (such as color gradients or threshold indicators), the system provides simple determination of perceptible differences while maintaining reliable optical analysis in the background.
3Measurement precision
If detailed comparison parameters are calculated to assess lens differences, then perceptible differences can be determined, but the system requires complex processing of design and definition parameters
Solution Approach 1:
The system pre-calculates and stores the relationship between design parameters, definition parameters, and comparison parameters in lookup tables or pre-computed models. When comparing lenses, it retrieves pre-established threshold values and comparison rules rather than performing complex real-time calculations, reducing processing complexity while maintaining precise difference detection.
Data Source
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AI summary
The invention relates to a computer-implemented method for assisting in determining the level of difference between a first ophthalmic lens and an ophthalmic reference characterized by one or more comparison parameters, by associating the ophthalmic lens and the ophthalmic reference with a point in a stimulus space, by calculating a distance between the comparison parameters of the first ophthalmic lens, the association depending on the user's ability to perceive the stimuli.