Vision Testing Device with Dark Adaptation Suppression
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Solution Overview
Problem
Conventional vision testing instruments face issues with learning effects and eye fatigue due to sequential testing of each eye, leading to inaccurate results and increased fatigue, particularly as testees must maintain concentration for extended periods without adequate rest.
Innovation Solution
A vision testing device and program that employs a head-mounted display (HMD) with a dark adaptation suppressing light presenting unit, which maintains a background light for both eyes during testing, preventing dark adaptation in the non-tested eye and presenting the target to one eye before the other eye's testing is completed, thus reducing fatigue and learning effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If vision testing is performed sequentially on one eye at a time using conventional instruments, then the testing procedure is simple and equipment is easy to operate, but learning effects occur and test accuracy deteriorates
Solution Approach 1:
The testing procedure is segmented into alternating intervals between two eyes. Instead of completing all tests on one eye before moving to the other, the system divides the testing into multiple short sessions, switching between eyes at predetermined intervals. This segmentation prevents learning effects while maintaining procedural simplicity through automated control.
Solution Approach 2:
The vision testing employs periodic action by alternating between left and right eye testing at predetermined intervals. The system performs a series of tests on one eye, then switches to the other eye for a series of tests, repeating this cycle throughout the examination. This periodic switching eliminates continuous fatigue accumulation in one eye while preventing learning effects.
2Productivity
If vision testing is performed continuously on one eye for extended periods, then testing efficiency is improved, but eye fatigue accumulates and test accuracy deteriorates
Solution Approach 1:
The system implements periodic action by structuring the testing into alternating sessions between eyes. Each eye undergoes multiple test sessions separated by brief intervals when the other eye is being tested. This periodic structure maintains high testing efficiency by keeping both eyes engaged in the testing process simultaneously, while preventing fatigue accumulation in any single eye.
Solution Approach 2:
The testing procedure maintains continuity of useful action by ensuring that while one eye is being tested, the other eye is also being tested. Rather than having idle periods where no testing occurs, the system continuously performs useful testing on both eyes in an alternating fashion, maximizing productivity while distributing fatigue evenly.
3Measurement precision
If the non-tested eye is shielded during vision testing, then the tested eye's vision can be accurately measured, but dark adaptation occurs in the non-tested eye affecting subsequent testing
Solution Approach 1:
The testing protocol is segmented into alternating intervals between eyes, with each eye receiving brief periods of exposure to ambient light during the other eye's testing session. This segmentation prevents prolonged dark adaptation in the non-tested eye while maintaining sufficient isolation during each eye's specific testing window to ensure measurement accuracy.
Solution Approach 2:
The system performs preliminary action by exposing the non-tested eye to ambient light during the tested eye's examination session. This preliminary exposure prevents dark adaptation from occurring in the non-tested eye, ensuring that when testing switches to the previously non-tested eye, it is already adapted to the lighting conditions, maintaining consistent and reliable test conditions.
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 approach allows for accurate test results by maintaining consistent vision testing conditions for both eyes, reducing eye fatigue and minimizing the learning effect, enabling testees to maintain concentration without bias towards one eye.
Implementation Method 1
a head-mounted display (HMD) with a dark adaptation suppressing light presenting unit, which maintains a background light for both eyes during testing, preventing dark adaptation in the non-tested eye
Data Source
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AI summary
Provided are a vision testing device and a vision testing program capable of obtaining a correct test result while reducing an accumulation of fatigue added on one of the eyes of a testee, including: image displays (13L, 13R) that present a light for suppressing a dark adaptation for both eyes (L, R) of a testee; and image displays (13L, 13R) that present a target for an eye (L, R, or both) of the testee so that the target is presented for one of the eyes R before the vision testing for the other eye L is ended.