Eye Fatigue Examining Device Using Light Quantity Difference
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Solution Overview
Problem
Existing eye fatigue examination methods, such as those using eye accommodation function measuring devices, are ineffective for middle-aged and elderly individuals due to presbyopia, which impairs the accommodative response of the eye, making it difficult to measure refractive power variations and thus diagnose eye fatigue objectively.
Innovation Solution
An eye-fatigue examining device that adjusts the light quantity difference between the eyes and detects gaze direction changes to objectively evaluate eye fatigue, using a light quantity difference deciding unit to determine the specific light quantity difference causing changes in gaze directions, allowing for the evaluation of fusional faculty strength, regardless of age.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time variation of refractive power is measured to examine eye fatigue, then eye fatigue can be objectively examined in young people, but the method becomes ineffective for middle-aged and elderly people with presbyopia
Solution Approach 1:
The invention changes the measurement parameter from time variation of refractive power to change in gaze direction. This parameter change allows the examination method to work effectively for both young people with normal accommodation function and middle-aged/elderly people with presbyopia, thereby resolving the contradiction between measurement precision for eye fatigue and adaptability to different age groups
Solution Approach 2:
The invention creates a universal eye fatigue examination method that can be applied to all age groups regardless of accommodation function status. By using gaze direction change as the measurement basis instead of refractive power variation, the method achieves multi-functionality across different physiological conditions
2Measurement precision
If light quantity difference is increased to evaluate fusional faculty, then objective examination of eye fatigue becomes possible, but measurement complexity increases
Solution Approach 1:
The invention introduces a light quantity difference adjusting unit as an intermediary device that systematically controls the light quantity difference between eyes. This intermediary enables objective measurement of fusional faculty by providing a controlled stimulus, while the automated adjustment process helps manage the overall system complexity
Data Source
AI summary
An eye-fatigue examining device and an eye-fatigue examining method capable of examining eye fatigue of a subject's eye regardless of an age of a patient are provided. The eye-fatigue examining device includes: a light quantity difference adjusting unit that increases a light quantity difference between lights respectively incident on right and left subject's eyes; a gaze direction detecting unit that detects gaze directions of the respective subject's eyes while the light quantity difference adjusting unit increases the light quantity difference; and a light quantity difference deciding unit that decides a specific light quantity difference at which a change in the gaze directions due to the increase in the light quantity difference occurs, based on the detection result of the gaze direction detecting unit.