Automated Visual Fixation Disparity Measurement System
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Solution Overview
Problem
Current methods for measuring visual fixation disparity, particularly proprioceptive feedback, are inaccurate and dependent on subjective patient feedback and practitioner technique, lacking automation and precision.
Innovation Solution
A system combining stereoscopic display technology with eye tracking, using a stereo LCD display or polarized light display, and image capture devices to monitor central vision, isolates central and peripheral vision, and adjusts the display to measure eye movement and alignment, ensuring accurate and automated measurement of visual fixation disparity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automated eye tracking and stereoscopic display are used, then measurement precision and automation are improved, but device complexity increases
Solution Approach 1:
The system divides visual field measurement into separate central and peripheral components using distinct display regions and tracking zones, allowing independent optimization of each measurement domain while maintaining overall system precision
Solution Approach 2:
The patent introduces specialized optical elements and computational algorithms as intermediaries between the stereoscopic display and eye tracking sensors, mediating the complex interaction between displayed stimuli and measured eye movements to achieve precise fixation disparity measurement
2Reliability
If central and peripheral vision are isolated for measurement, then measurement reliability is improved, but measurement time increases
Solution Approach 1:
The system employs periodic alternation between central and peripheral visual stimuli presentation, cycling through different field isolation conditions in a structured sequence that maintains measurement reliability while minimizing total testing duration through efficient temporal organization
Solution Approach 2:
The eye tracking system operates continuously throughout the measurement protocol, maintaining uninterrupted monitoring of ocular movements while the stimulus presentation is periodically modified to isolate different visual fields, thereby eliminating idle measurement time
Data Source
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AI summary
There is disclosed herein a system for measuring visual fixation disparity comprising a display apparatus for presenting stereoscopic visual content to a patient. A sensing apparatus tracks eye movement of the patient. A controller controls the display apparatus to stereoscopically display a central image target alternately to a left eye and a right eye of the patient and tracking eye movement for a period of time as the central image target is alternated between the left eye and the right eye, and incrementally relocating the central image target left and right images until the patient perceives the left and right images to be physically coincident.