Automated Visual Fixation Disparity Measurement System
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Solution Overview
Problem
Current methods for measuring visual fixation disparity are inaccurate due to reliance on subjective patient feedback and practitioner technique, lacking repeatable accuracy and independence from these factors.
Innovation Solution
A system combining stereoscopic display technology with eye tracking, using a stereo LCD display and polarized light, to present stereoscopic visual content and track eye movement, isolating central vision from peripheral vision and measuring proprioceptive disparity through automated processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subjective patient feedback and practitioner technique are used to measure visual fixation disparity, then the measurement process is simple and easy to perform, but the measurement precision and reliability are poor
Solution Approach 1:
The patent replaces the manual, subjective measurement process with an automated optical system using infrared illumination, cameras, and image processing algorithms to objectively track eye position and calculate fixation disparity, eliminating reliance on patient feedback and practitioner technique
Solution Approach 2:
The system uses the patient's own eye reflections of infrared light sources to automatically track eye position without requiring external markers or complex setup, allowing the measurement to be performed using the subject's inherent optical properties
2Reliability
If automated eye tracking with stereoscopic display is used to measure visual fixation disparity, then the reliability and repeatability of measurement improve, but the device complexity and cost increase
Solution Approach 1:
The system uses a single stereoscopic display device to present both the test stimuli and capture eye images through integrated cameras, combining multiple functions into one apparatus to reduce overall system complexity while maintaining measurement reliability
Solution Approach 2:
The patent introduces infrared light sources and filters as intermediaries to enable eye tracking without interfering with the patient's natural vision of the test targets, allowing simultaneous presentation of visual stimuli and capture of eye position data
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables accurate, automated measurement of visual fixation disparity, independent of patient interpretation and practitioner technique, by correlating central and peripheral images and tracking eye movements to determine alignment and fusion disparities.
Implementation Method 1
A system combining stereoscopic display technology with eye tracking, using a stereo LCD display and polarized light, to present stereoscopic visual content
Implementation Method 2
A sensing apparatus tracks eye movement of the patient
Data Source
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.