Visual Field Testing Apparatus Color Sensitivity
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Solution Overview
Problem
Current methods for testing color-related visual functions, such as those used in detecting eye diseases like glaucoma, are inadequate in assessing color sensitivity across different regions of the visual field, as they often confuse luminance differences with color differences, leading to inaccurate results.
Innovation Solution
A testing apparatus and method that displays a visual target with a chromatic color in a background of similar luminance, changing the target's size based on the subject's response to determine perception thresholds at various points in the visual field, allowing for precise evaluation of color sensitivity without moving the gaze point and reducing measurement errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the luminance of the visual target and background are set to be the same, then color perception accuracy is improved, but luminance difference perception becomes confounding
Solution Approach 1:
The patent applies local quality by setting the luminance of the visual target and background to be substantially the same (within ±10%), thereby eliminating luminance contrast as a confounding factor in specific test regions. This allows color perception to be tested independently from luminance perception, resolving the contradiction between color accuracy and luminance confounding.
Solution Approach 2:
The patent changes the luminance parameter of the visual target to match the background luminance, transforming the test condition from one where luminance and color differ to one where only color differs. This parameter change enables accurate color perception testing without luminance interference.
2Quantity of substance
If a grid is displayed as a visual target, then the visual field can be tested, but sensitivity for each color in each region cannot be obtained
Solution Approach 1:
The patent segments the visual field into multiple test regions and uses individually adjustable visual targets in each region rather than a single grid. This segmentation allows independent measurement of color sensitivity in each region, resolving the contradiction between comprehensive visual field testing and precise color sensitivity measurement.
Solution Approach 2:
The patent employs dynamic visual targets that can be adjusted in size and color independently in each test region, allowing the test to adapt to the subject's responses. This dynamic adjustment enables precise color sensitivity measurement while maintaining comprehensive visual field coverage.
3Measurement precision
If the visual target size is changed to determine perception threshold, then color sensitivity can be measured, but the test complexity increases
Solution Approach 1:
The patent implements feedback by adjusting the visual target size based on the subject's responses. The target size is dynamically modified according to whether the subject detects the target, allowing automatic determination of perception thresholds. This feedback mechanism achieves precise measurement while automating the process to reduce procedural complexity.
Data Source
AI summary
Provided are an apparatus and a method, for testing a visual function of a subject, that make it possible to appropriately test the sensitivity for each color for each region of a visual field. In a state in which the subject is caused to gaze at one point 6 in a background 7, a visual target 5 for testing a color-related visual function of the subject is displayed in a peripheral region of the gaze point 6 such that the luminance of the background 7 has a numerical value included between a numerical value smaller by 10% and a numerical value greater by 10% than the luminance of the visual target 5. Then, for each measurement point 300, a threshold that is a size of the visual target 5 that determines whether or not the subject can perceive the visual target 5 is obtained for a plurality of times.