Visual Field Testing via Inter-Eye Distance Calibration
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Solution Overview
Problem
Traditional visual field testing systems are limited by their large size, lack of portability, reliance on eye cameras for fixation verification, use of mechanical clickers for response, and failure to account for individual inter-eye distances, leading to degraded test accuracy and discomfort.
Innovation Solution
A method and system that determine inter-eye distance to display tailored visual stimuli on separate regions of a two-dimensional display, track responses without cameras, and allow motion-based feedback, eliminating the need for eye patches and enhancing luminance resolution, enabling accurate and comfortable testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bowl-based visual field testing systems are used, then test accuracy can be maintained, but the system size becomes large and portability is lost
Solution Approach 1:
The patent uses a two-dimensional display screen to present visual stimuli that simulate the three-dimensional visual field testing experience. Instead of requiring a physical bowl-shaped projection system, the invention creates a virtual copy of the visual field environment on a flat screen, maintaining measurement accuracy while dramatically reducing system size and enabling portability.
2Measurement precision
If eye cameras are used for fixation verification, then subject alignment can be monitored, but device complexity increases
Solution Approach 1:
The patent removes the eye camera component from the system entirely. Instead of using optical devices to monitor fixation, the invention extracts the fixation verification function and implements it through software-based detection of subject responses and visual field patterns, significantly reducing device complexity while maintaining alignment monitoring capability.
3Reliability
If mechanical clickers are used for subject response, then response tracking is reliable, but ease of operation decreases
Solution Approach 1:
The patent replaces mechanical clickers with motion-based response detection. The system uses the device's motion sensors to detect subject movements such as head nods or body motions as responses to visual stimuli. This substitution eliminates mechanical components, improves ease of operation by allowing natural movement-based feedback, while maintaining reliable response tracking through digital sensor data.
4Measurement precision
If eye patches are used to cover the non-examined eye, then test accuracy can be maintained, but subject comfort decreases and light adaptation issues arise
Solution Approach 1:
The patent removes the eye patch from the testing system. Instead of physically covering the non-examined eye, the invention extracts the eye occlusion function and implements it through software by presenting eye-specific visual stimuli that naturally prevent cross-eye compensation. This eliminates subject discomfort and light adaptation issues while maintaining test accuracy through digital control of visual input to each eye.
5Ease of manufacture
If standard inter-eye distance is assumed for all subjects, then device setup is simplified, but measurement precision deteriorates
Solution Approach 1:
The patent implements dynamic adjustment of inter-eye distance parameters based on individual subject measurements. The system allows clinicians to input or measure the specific inter-pupillary distance for each subject and automatically adjusts the visual field test parameters, stimulus positioning, and analysis algorithms accordingly. This dynamic customization maintains measurement precision for each individual while keeping the setup process simple through digital configuration rather than physical adjustment.
Data Source
AI summary
A system and a method for testing a visual field of a subject are described. The method includes determining inter-eye distance of the subject. Visual stimuli are displayed on a left display region and a right display region of a two-dimensional display to the subject based on the determined inter-eye distance. The left display region is configured to display content specific to the left eye and the right display region is configured to display content specific to the right eye of the subject. Subject responses to the visual stimuli are tracked. Based on the subject responses, a condition of the visual field of each eye the subject is evaluated and then results of the evaluation describing the subject's visual field condition is reported or stored.