Computer Vision Astigmatism Testing Using Color Bars
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Solution Overview
Problem
Existing astigmatism testing methods lack accuracy, particularly in assessing astigmatic components of the eye, which is crucial for individuals with less than perfect eyesight, as they affect a significant portion of the population.
Innovation Solution
The development of computer-implemented methods that display differently colored bars against a contrasting background, allowing subjects to separate and join the bars, and rotate a circular grating pattern within an annulus of radial lines to detect the angle of astigmatism, providing a more accurate measurement of astigmatic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional automated vision testing methods are used, then the testing can be performed without lenses or optometrist intervention, but the accuracy of astigmatism assessment is insufficient
Solution Approach 1:
The patent employs differently colored bars (e.g., red and green) that rotate and change orientation to detect astigmatism. The color differentiation enhances the subject's ability to perceive and respond to the test stimuli, improving measurement precision for astigmatism assessment while maintaining automated testing without requiring complex lens systems
Solution Approach 2:
The test bars are designed to rotate dynamically through various angles during the testing process. This dynamic rotation allows the system to assess astigmatism at multiple orientations, improving measurement accuracy while using simple graphical display elements rather than complex optical devices
2Measurement precision
If traditional astigmatism tests are used, then the testing procedure is simpler, but the accuracy of detecting astigmatic components is compromised
Solution Approach 1:
The use of contrasting colors for different bars provides clear visual differentiation that enhances the subject's ability to detect and respond to astigmatic distortion, improving measurement precision while maintaining ease of operation through intuitive color-based responses
Solution Approach 2:
The patent adds the dimension of color to the traditional orientation-based astigmatism test. By incorporating color-coded bars that rotate, the system enhances detection accuracy for astigmatic components while keeping the interface simple and easy to operate through color-based visual cues
Data Source
AI summary
Disclosed are computer implemented methods for testing astigmatism which display differently colored bars against a contrasting background. In one implementation, parallel colored bars are separated and joined through various angles of rotation against a constant background. In another implementation one set of bars is formed by variable grating pattern which is rotated within an annulus of solid color bars, desirably against a contrasting intermediate background and a reference background having a linear grating pattern.