Head-Mounted Display Calibration for Cyclotorsion-Accurate Visual Testing
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Solution Overview
Problem
The introduction of visual field testing into head-mounted display devices is hindered by the lack of cyclotorsion compensation, which causes misdiagnosis due to head tilting, and the challenge of displaying accurate testing patterns on flat surfaces instead of curved ones.
Innovation Solution
Implementing specialized sensors and software in head-mounted displays to detect head tilting and generate alerts or corrections, and using coordinate transformations to replicate curved surface testing patterns on flat surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional visual field testing machinery is used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses virtual reality headsets to create a virtual curved testing environment that replicates the functionality of conventional visual field testing machinery. The system projects testing patterns onto virtual curved surfaces within the headset display, allowing patients to undergo comprehensive visual field testing without requiring expensive physical equipment. This virtual copying approach maintains measurement precision while significantly reducing device complexity and cost.
2Device complexity
If head-mounted display is used, then device complexity is reduced, but measurement precision deteriorates due to lack of cyclotorsion compensation
Solution Approach 1:
The patent implements a feedback mechanism that continuously monitors head position and orientation data from sensors within the headset. The system detects head tilts and rotational movements in real-time, then dynamically adjusts the displayed testing patterns to compensate for these movements. This active feedback correction ensures that measurement precision is maintained despite the simplified head-mounted display configuration, addressing the cyclotorsion issue through continuous adaptation.
Solution Approach 2:
The system changes the parameters of the displayed testing patterns based on detected head position. When head tilt or rotation is detected, the system transforms the coordinates and orientation of the testing patterns to account for the head movement. This parameter transformation ensures that the testing patterns remain accurately positioned relative to the patient's visual field despite changes in head orientation, thereby maintaining measurement precision.
3Ease of manufacture
If flat surface display is used, then ease of manufacture is improved, but measurement precision deteriorates due to non-uniform curvature
Solution Approach 1:
The patent employs virtual curvature techniques to simulate a curved testing surface within the flat display environment of the headset. By mathematically transforming the coordinates and projecting patterns as if they were on a curved surface, the system replicates the optical properties of traditional curved testing equipment. This virtual spheroidality approach maintains measurement precision related to curvature while retaining the manufacturing simplicity of flat display technology.
Data Source
AI summary
Some systems and methods disclosed herein facilitate calibration of a head-mounted display while a visual test is performed. One mechanism of facilitating calibration involves detecting, as a visual test is being performed, that the user's eyes moved in the direction of a displayed stimulus but have not stopped at the point of where the stimulus is displayed, and instead stopped at a different point (e.g., a threshold distance away from the stimulus). Based on that detection, the system may determine that the user has seen the stimulus and that calibration of the sensors is needed. The system may then record that the user has seen the stimulus and perform sensor calibration before displaying the next stimulus.