Visual Function Detection via Moving Image and Gaze Tracking
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Solution Overview
Problem
Conventional visual function detection methods, such as using Landolt rings, are inadequate for infants and objective determination of visual function is challenging, as they rely on self-declaration or subjective assessment.
Innovation Solution
A visual function detection apparatus that displays an image within a display region on a screen and moves it, using a stereo camera system to detect the gazing point and eyeball movement, thereby objectively determining the visual function based on the relation between the image movement and the gazing point or eyeball direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods like Landolt rings are used for eyesight examination, then the examination can be performed with simple equipment, but the test subject is required to self-declare how he/she sees making objective determination difficult
Solution Approach 1:
The patent introduces an intermediary system consisting of a display device showing moving images and a detection device tracking gazing points and eyeball movements. This intermediary system objectively measures visual function by detecting the relationship between image movement and eye movement, eliminating the need for subject self-declaration while maintaining examination effectiveness
Solution Approach 2:
The patent replaces the mechanical/subjective system of self-declaration with an optical/electronic detection system. By using cameras to track gazing points and eyeball movements, and analyzing the relationship between image movement and eye movement, the system achieves objective measurement without requiring mechanical interaction or subjective response from the test subject
2Adaptability or versatility
If self-declaration method is used for eyesight examination, then the examination process is simple and quick, but appropriate examination cannot be performed for test subjects such as infants who cannot self-declare
Solution Approach 1:
The patent enables the examination system to serve itself by automatically detecting and analyzing eye movements and gazing points without requiring the test subject to actively participate in self-declaration. The system passively captures eyeball movement data and automatically processes it to determine visual function, making it applicable to infants and other subjects who cannot self-declare while maintaining measurement accuracy
3Measurement precision
If moving image display is used to detect gazing point movement, then objective determination of visual function is achieved, but the system requires coordination between display controller and gazing point detector
Solution Approach 1:
The patent implements a feedback mechanism where the display controller displays moving images and the gazing point detector tracks eye movements in real-time. The system continuously monitors the relationship between image movement and gazing point movement, using this feedback to objectively determine visual function. This coordinated feedback loop achieves precise measurement while managing system complexity through integrated control
Data Source
AI summary
A visual function detection apparatus includes: a display controller configured to cause an image for determination to be displayed in a display region on a display screen of a display unit and move the image for determination within the display region; a gazing point detector configured to detect a position of a gazing point of a test subject observing the display screen; a relation detector configured to detect relation information among a position of the image for determination on the display screen, a moving direction of the image for determination, and a moving direction of the gazing point; and a visual function detector configured to detect a visual function of the test subject based on the relation information.