Visual Field Zone Segmentation for Objective Vision Testing
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Solution Overview
Problem
Current visual testing methods for assessing an individual's quality of vision are subjective and do not provide concrete measurement results, failing to indicate areas of sharp and blurred vision within the visual field.
Innovation Solution
A method involving an individual observing a test image at a predetermined viewing distance, with natural head posture, to determine and record the boundaries of optimal and degraded vision zones, allowing for an objective demonstration of vision quality by comparing these zones with and without ophthalmic visual correction equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional visual testing methods are used, then the testing process is simple, but the measurement precision and objectivity of vision quality assessment deteriorates
Solution Approach 1:
The visual field is segmented into multiple zones (optimal vision zone and degraded vision zone) by determining boundaries at different visual acuity thresholds. This segmentation transforms the continuous visual field into discrete measurable regions, enabling precise objective assessment of vision quality without requiring complex equipment.
Solution Approach 2:
A display surface serves as an intermediary between the test subject and the testing system. The display surface presents visual stimuli and captures boundary indicators, enabling objective measurement while maintaining a simple testing setup that can be implemented in常规 optician settings.
2Loss of information
If conventional visual testing methods are used, then the testing procedure is straightforward, but the information completeness about visual field quality deteriorates
Solution Approach 1:
The visual field is divided into distinct zones (optimal and degraded vision zones) with clearly defined boundaries. This segmentation captures comprehensive information about visual field quality distribution, showing not just overall acuity but the spatial extent and location of different vision quality regions.
Solution Approach 2:
The testing method transitions from one-dimensional acuity measurement to two-dimensional visual field mapping. By determining boundary positions and shapes on the display surface, the method captures spatial distribution information of vision quality across the entire visual field, providing comprehensive dimensional data.
3Reliability
If subjective visual testing is used, then the testing process is simple, but the reliability and comparability of results deteriorates
Solution Approach 1:
The method incorporates feedback by comparing boundary indicators obtained with different ophthalmic devices. This comparison provides objective feedback on device performance and vision correction effectiveness, enhancing result reliability while maintaining operational simplicity through standardized comparison procedures.
Solution Approach 2:
The visual field boundaries and quality zones are copied and recorded as objective data (boundary indicators) that can be stored, compared, and analyzed. This copying transforms subjective visual experience into objective measurable data, improving reliability without significantly complicating the testing operation.
Data Source
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AI summary
The invention relates to a method of visual testing of an individual (10) comprising steps consisting in: a) placing said individual at a predetermined observation distance (D1) from a display surface (21) at which said individual observes, with a natural head carriage, said display surface, b) displaying, on said display surface, a visual test comprising at least one test image (22) in a visual field of said individual, and c) determining, on said display surface, a boundary (23) of zones of optimal/degraded vision of said test image by the individual in the configuration resulting from steps a) and b), said boundary delimiting respectively a zone of optimal vision (23A) and a zone of degraded vision (23B) of said visual field, for which zones said individual indicates that he sees said test image of the visual test in an optimal manner, respectively in a degraded manner.