Head-Mounted Display Visual Field Testing Tilt Compensation
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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, which causes visual field tilting when the user's head is tilted, and the inability to replicate the curved surface of traditional visual field analyzers on flat head-mounted display surfaces.
Innovation Solution
The use of specialized software and hardware in head-mounted display devices to detect head tilting and generate alerts or recommendations for correction, along with the generation of visual field testing patterns that account for the flat surface of the head-mounted display by using icons displayed at respective locations in the visual field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If head-mounted display devices are used for visual field testing, then accessibility and cost are improved, but accuracy is worsened due to lack of cyclotorsion and head tilting
Solution Approach 1:
The system uses sensors to detect head position and orientation in real-time, providing feedback to the control circuitry which then adjusts the display of visual stimuli and interpretation of results accordingly. This closed-loop feedback system compensates for the lack of cyclotorsion and head tilting issues.
Solution Approach 2:
The system changes the parameters of visual stimulus presentation based on detected head orientation. When head tilt is detected, the system adjusts the position, orientation, and timing of visual stimuli to account for the altered visual field geometry, thereby maintaining measurement accuracy despite the different physical constraints of head-mounted displays.
2Measurement precision
If head tilting is prevented using conventional structures, then accuracy is improved, but device complexity and ease of operation are worsened
Solution Approach 1:
The patent replaces mechanical constraint structures (like chin rests) with an electronic sensor-based system. Sensors detect head orientation and the control circuitry software-compensates for tilting effects, eliminating the need for complex mechanical prevention structures while maintaining measurement accuracy.
Solution Approach 2:
The system allows the user to wear the head-mounted display naturally without special positioning structures. The sensors and control algorithms work together to automatically compensate for any head tilting, making the device self-correcting and eliminating the need for external constraint mechanisms.
3Adaptability or versatility
If visual field testing is adapted to flat head-mounted display surfaces, then accessibility is improved, but measurement precision is worsened due to non-uniform curvature
Solution Approach 1:
The system dynamically adjusts the parameters of visual stimulus presentation based on the flat surface geometry of the head-mounted display. The control circuitry calculates corrected positions and orientations of stimuli to account for the non-uniform curvature, ensuring accurate mapping to the user's visual field despite the flat display surface.
Solution Approach 2:
The patent transforms the two-dimensional flat display surface into an effective three-dimensional visual field mapping by using sensors to detect head orientation and adjusting stimulus presentation accordingly. This dimensional transformation allows accurate visual field testing on a flat surface by compensating in the angular/orientation dimension.
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
This solution improves the accuracy of visual field testing in head-mounted displays by preventing errors caused by head tilting and ensuring that the visual field testing patterns are accurately displayed on the flat surface, thereby enhancing accessibility and reducing costs.
Implementation Method 1
retrieving data from a tilt sensor, located at the head-mounted display, for detecting degrees of head tilt of a user wearing the head-mounted display
Data Source
AI summary
A method is disclosed for improving accuracy of visual field testing in head-mounted displays. The method includes retrieving a visual field testing pattern for a head-mounted display, the visual field testing pattern including icons displayed at respective locations in a visual field of the head-mounted display. The visual field testing pattern is generated on the head-mounted display. Data is retrieved from a tilt sensor, located at the head-mounted display, for detecting degrees of head tilt of a user wearing the head-mounted display and the degree of head tilt is determined. A comparison is made between the degree of head tilt of the user to a first threshold degree. In response to the degree of head tilt of the user meeting or exceeding the first threshold degree, a recommendation to the user is generated for display on the head-mounted display.