Gaze-Based Visual Field Evaluation Using Offset Indicator Detection
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Solution Overview
Problem
Current methods for evaluating visual field deficiencies, such as those caused by glaucoma, are inadequate in determining recognition of indicators with peripheral vision, leading to inaccurate assessments.
Innovation Solution
An evaluation device and method that includes a display screen, gaze point detection, and an arithmetic unit to display an indicator at an offset position relative to the gaze point, determining recognition based on the gaze point's movement towards the indicator, even if the offset position is outside the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an indicator is presented only when an examinee gazes at the presented indicator, then the examinee can recognize the indicator with central vision, but it is difficult to determine whether the examinee can recognize an indicator with peripheral vision
Solution Approach 1:
The indicator position is dynamically adjusted based on the detected gaze point position. The indicator is displayed at an offset position relative to the gaze point, allowing the indicator to appear in different locations (including peripheral visual fields) as the examinee moves their gaze, thereby enabling peripheral vision assessment without requiring the examinee to consciously shift attention to specific test locations
Solution Approach 2:
The system continuously detects the examinee's gaze point position and uses this information to determine indicator placement and recognition. By monitoring whether the gaze point moves toward the indicator's offset position, the system provides real-time feedback to evaluate peripheral vision recognition capability, resolving the contradiction between measurement precision and operational simplicity
2Measurement precision
If the offset position is located outside the display screen, then the indicator can be presented in the peripheral visual field, but the indicator cannot be displayed on the screen
Solution Approach 1:
A gaze point detection unit serves as an intermediary between the examinee's visual attention and the indicator display system. This intermediary detects the gaze point position and calculates the appropriate offset position for indicator placement, enabling the system to present indicators in peripheral visual fields (even conceptually outside the physical screen boundaries) while maintaining simple display hardware requirements
3Measurement precision
If conventional evaluation methods are used, then the examination process is simple, but the evaluation accuracy of visual field deficiency is insufficient
Solution Approach 1:
The examinee's own gaze movements serve as the test stimulus. By displaying the indicator at an offset position from the gaze point and detecting whether the gaze moves toward the indicator, the system uses the examinee's natural visual exploration behavior to assess peripheral vision, eliminating the need for complex instruction-following procedures while maintaining high evaluation accuracy
Data Source
AI summary
An evaluation device includes: a display screen configured to displays images; a gaze point detection unit configured to detect a position of a gaze point of an examinee who observes the display screen; a display controller configured to display an indicator at an offset position having a predetermined relative positional relationship with the gaze point on the display screen based on a detection result of the position of the gaze point; an arithmetic unit configured to determine whether the examinee has recognized the indicator; and an evaluation unit configured to evaluate a visual function of the examinee based on a determination result from the arithmetic unit, wherein the arithmetic unit is further configured to determine that the examinee has recognized the indicator when the gaze point moves toward the indicator and thus the offset position is located outside the display screen.