Parallactic Visual Field Enhancer for Homonymous Hemianopsia
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Solution Overview
Problem
Current visual field testing methods are ineffective and inaccurate for assessing dysfunction between the ambient and focal visual processes, often producing false negative results and failing to accurately diagnose conditions like homonymous hemianopsia, which affects spatial orientation, balance, and daily living skills in individuals with neurological events such as TBI or CVA.
Innovation Solution
A parallactic ambient visual-field enhancing (PAVE) system using a head-mounted holographic or virtual display device that creates a temporal-spatial dissociation between the ambient and focal visual processes by rendering a fixation target and a moving background, allowing the user to focus on a stationary target while the background moves, thereby disassociating and differentiating the bi-modal visual processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If standard automated visual field testing is used, then the testing process is standardized and automated, but the accuracy of diagnosing homonymous hemianopsia deteriorates due to false negative results
Solution Approach 1:
The invention segments the visual field testing into two distinct components: a focal visual process (fixation on a central target) and an ambient visual process (peripheral motion detection). By presenting a stationary fixation target and a separately controllable moving background pattern, the system can independently assess each visual process and their interaction, thereby improving diagnostic accuracy for homonymous hemianopsia while maintaining automation.
2Ease of operation
If monocular assessment with steady fixation is required, then the testing procedure is simplified and standardized, but the ability to detect ambient visual process dysfunction deteriorates
Solution Approach 1:
The invention introduces dynamic motion of the background pattern while maintaining steady fixation on the central target. The moving pattern (e.g., drifting grating or expanding/contracting circles) creates temporal changes in the peripheral visual field that stimulate the ambient visual process, allowing reliable detection of its dysfunction while keeping the fixation requirement simple and standardized.
3Productivity
If sequential isolated lights are presented in peripheral field, then the testing instrument can map visual field systematically, but the temporal-spatial dissociation between ambient and focal processes deteriorates
Solution Approach 1:
The invention merges the assessment of focal and ambient visual processes into a single integrated test presentation. Both the stationary fixation target and the moving background pattern are displayed simultaneously in the same visual field, allowing the system to evaluate how these two visual processes interact spatially and temporally, thereby improving the precision of temporal-spatial dissociation assessment while maintaining efficient visual field mapping.
Data Source
AI summary
A method for creating a temporal-spatial dissociation between an ambient visual process and a focal visual process of a user is provided. The method includes rendering, via a parallactic ambient visual-field enhancing (PAVE) module configured to execute on a computing device communicatively coupled to a head mounted display device worn by a user, a fixation target and a background located behind the fixation target displayed within the head mounted display device. The method further includes updating, via the PAVE module, the rendering of the background within the head mounted display device, wherein the update comprises a virtual movement of the background behind the fixation target.