Visual Field Measurement Device Scanning Test Spot Paths
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Solution Overview
Problem
Current visual field measurement methods, such as perimetry, are laborious, time-consuming, and prone to variability, especially for older patients, as they require prolonged concentration and subjective patient feedback, leading to inconsistent results.
Innovation Solution
A method and device that rapidly scan the visual field by moving a test spot along predefined paths on a display, triggering interaction when the spot becomes invisible or visible, allowing for precise recording of visual field data within a short time, facilitating the detection of scotomas and improving data accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional perimetry methods are used to measure visual field, then measurement precision can be achieved, but examination time becomes excessively long and patient cooperation becomes difficult
Solution Approach 1:
The patent applies the 'Skipping (Rushing through)' principle by moving the test spot rapidly across the visual field at predetermined locations rather than using slow kinetic methods. The test spot is presented at multiple locations in quick succession, allowing the examination to be completed in about one minute while still achieving accurate threshold determination through the patient's responses at each location.
Solution Approach 2:
The patent implements 'Preliminary action' by pre-defining the path and locations where the test spot will be presented. The examination program automatically determines the sequence and positions of test spots before the actual measurement begins, eliminating the need for slow, manual kinetic scanning and allowing rapid presentation of stimuli at optimally selected locations.
2Measurement precision
If slow horizontal or vertical approach to perception threshold is used, then subjective perception threshold can be determined, but the process becomes laborious and time-consuming
Solution Approach 1:
The patent replaces the mechanical, manual approach of kinetic perimetry with an automated computer-controlled system. The examination program automatically presents test spots at predetermined locations and records patient responses, eliminating the laborious manual operation while maintaining accurate threshold determination through systematic testing at multiple locations.
Solution Approach 2:
The patent achieves continuous measurement by presenting test spots in rapid succession across multiple predetermined locations without interruption. The examination flows continuously through the predefined path, collecting data at each location without the pauses and manual repositioning required in traditional kinetic methods, thereby maintaining both accuracy and efficiency.
3Ease of operation
If automated computer perimetry programs are used, then examiner workload is reduced, but patient examination time remains long
Solution Approach 1:
The patent applies 'Partial or excessive action' by testing at a limited number of strategically selected predetermined locations rather than comprehensively scanning the entire visual field. This partial approach focuses measurements on key areas where visual field defects are most likely to occur, reducing examination time to about one minute while maintaining diagnostic value through automated recording of patient responses.
Data Source
AI summary
The invention relates to a method for measuring the visual field of a person by means of a device, comprising the following steps: displaying a visually detectable test spot on a surface display of the device, which surface display is viewed by the person by means of an eye of the person, wherein a spatial position of the head of the person remains unchanged with respect to the surface display; moving the test spot on the surface display by means of the device along a path during a measurement pass and activating an interaction means of the device by the person if the displayed test spot stops being visible or becomes visible again to the person at a current position during the movement of the test spot along the path, wherein, by activating the interaction means, the device is prompted to store the particular current position and any associated information from which it can be derived whether the test spot has stopped being visible or has become visible again for the person at the current position; and displaying a range of the visual field of the person on a further surface display, wherein said current positions form boundary points of the range.