Lower Half Visual Field Display for Postural Instability Measurement
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Solution Overview
Problem
Existing methods for measuring visually-induced postural instability are expensive, require sophisticated hardware and skilled professionals, and are not scalable due to their large dimensions and complexity.
Innovation Solution
A method using a semi-transparent, diffusive screen with a conic transversal shape placed in the lower half of the visual field to display dynamic patterns, allowing measurement of postural instability with reduced equipment costs and complexity, focusing on visual stimuli that primarily affect the lower half of the visual field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a CAVE system with immersive virtual reality environment is used to measure visually-induced postural instability, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The invention extracts only the essential functional component needed for measurement - the lower half visual field display - from the complex CAVE system. By displaying dynamic visual patterns only in the lower half visual field (at least 50% coverage) while leaving the upper half free, the system achieves sufficient measurement precision without requiring immersive virtual reality environments, multiple projectors, or sophisticated hardware/software infrastructure.
Solution Approach 2:
The invention replaces expensive, sophisticated CAVE system hardware with simple, commonly available visual display devices such as screens or projectors. This substitution dramatically reduces device complexity and cost while maintaining the ability to measure visually-induced postural instability through dynamic visual pattern display in the lower half visual field.
2Measurement precision
If a CAVE system is used for measurement, then measurement precision is improved, but the overall dimensions and space requirements increase
Solution Approach 1:
The invention extracts only the necessary visual stimulation function from the CAVE system by confining the dynamic visual pattern display to the lower half visual field (at least 50% coverage). This eliminates the need for room-sized immersive environments while maintaining measurement precision, as the critical visual-induced postural instability responses are captured through lower half visual field stimulation alone.
3Measurement precision
If a CAVE system is used, then measurement precision is improved, but ease of operation deteriorates due to requirement of highly skilled professionals
Solution Approach 1:
The invention replaces sophisticated CAVE system infrastructure with simple, commonly available visual display devices that can be operated without highly skilled professionals. The simplified setup using screens or projectors displaying dynamic visual patterns in the lower half visual field makes the measurement method accessible for routine use while maintaining measurement precision.
4Measurement precision
If visual display device covers entire visual field, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The invention extracts only the essential visual stimulation function by displaying dynamic visual patterns exclusively in the lower half visual field (at least 50% coverage) while leaving the upper half visual field free. This selective approach achieves sufficient measurement precision for visually-induced postural instability without requiring complex full-field immersive display systems.
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
Enables easy and cost-effective measurement of visually-induced postural instability, using commonly available and compact visual display devices, effectively capturing the influence of visual stimuli on balance resilience with increased immersion and sensory conflicts.
Implementation Method 1
a visual display device comprising a semi-transparent diffusive screen is provided in the lower half visual field of the person
Implementation Method 2
the semi-transparent diffusive screen is curved so as to have a conic transversal shape
Data Source
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AI summary
Method for measuring the visually-induced postural instability of a person, the method comprising: • a display providing step (S1) during which a visual display device is provided and arranged so as to display a dynamic visual pattern in at least 50 % the lower half visual field of the person and to leave the upper half visual field of the person free, • a display step (S2) during which a dynamic visual pattern is displayed on the visual display device, • a measuring step (S3) during which a parameter representative of the postural instability is measured when the person is gazing at a fix target straight in front of him while having the dynamic visual pattern displayed on the visual display device.