Virtual Reality Eye Tracking for Objective Convergence Measurement
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Solution Overview
Problem
Existing methods for assessing binocular vision disorders, such as convergence defects, are subjective and dependent on practitioner observation, leading to inaccurate diagnoses and lack of patient engagement during rehabilitation.
Innovation Solution
A method using a virtual reality headset and eye tracker to objectively measure convergence by displaying an animated object approaching the patient, measuring gaze directions, and calculating convergence values without manual intervention, maintaining patient engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a practitioner manually manipulates a rod to test convergence, then the examination can be performed with simple equipment, but the measurement accuracy and reliability are compromised due to practitioner distraction and subjective observation
Solution Approach 1:
The patent replaces the manual mechanical manipulation of a rod by a practitioner with an automated computer-controlled system. The rod is moved by a motorized mechanism along a guide, eliminating human error in manipulation. The observation of eye movement is replaced by electronic sensors and cameras that automatically track and record convergence data, substituting mechanical observation with electronic detection systems.
Solution Approach 2:
The patent introduces an intermediary computerized control system between the practitioner and the convergence testing apparatus. This intermediary automatically coordinates the rod movement, triggers observations at precise moments, and processes the data, removing the need for continuous practitioner attention while maintaining measurement accuracy.
2Reliability
If traditional convergence testing is repeated over time for rehabilitation, then the patient's progress can be monitored, but the process becomes monotonous and leads to patient abandonment
Solution Approach 1:
The patent transforms the static, repetitive nature of traditional convergence testing into a dynamic, adaptive system. The computerized platform can automatically adjust testing parameters, vary the presentation of visual stimuli, and provide real-time feedback to the patient. This dynamic adaptation keeps rehabilitation sessions engaging while maintaining consistent monitoring of progress over time.
Solution Approach 2:
The patent implements an automated feedback system that provides the patient with real-time information about their convergence performance. The system can display visual feedback, provide auditory cues, or generate reports showing progress, making the rehabilitation process more interactive and motivating while ensuring consistent evaluation across multiple sessions.
3Measurement precision
If objective measurement devices are used to eliminate practitioner subjectivity, then measurement reliability improves, but the device complexity and cost increase
Solution Approach 1:
The patent designs a multi-functional integrated system where a single computerized platform performs multiple functions: controlling rod movement, presenting visual stimuli, tracking eye position, recording data, and providing feedback. This universal system consolidates what would otherwise require multiple separate devices, reducing overall complexity while maintaining objective measurement capabilities.
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
Provides accurate, real-time convergence measurements independent of practitioner concentration, enhancing diagnostic precision and patient interest during rehabilitation.
Implementation Method 1
the direction of gaze of each eye of the patient is measured using the eye tracker
Data Source
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AI summary
The invention relates to a method (PR) for measuring the convergence of the eyes (E) of a patient (P), said method being implemented by a device comprising a virtual reality headset (1) and an oculometer (3), the method comprising the following steps: (E1) an animation that generates an effect that causes an object (V) to appear to spring out toward the patient is displayed on a display (2) of the headset; (E2) the direction of the gaze (O1, O2, N) of each eye of the patient is measured during the display of the animation, by means of the oculometer; on the basis of each measured direction of the gaze, a convergence value (α1,α2,αΝ) is computed for each eye of the patient.