Age-Adjusted Target Screening for Ophthalmic Fatigue
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Solution Overview
Problem
Current methods for diagnosing ophthalmic fatigue, such as the RAF rule, often result in overestimated minimum accommodation distances, leading to prescription errors and a failure to identify individuals who require anti-fatigue glasses or additional ophthalmic care.
Innovation Solution
A method and device that adjust the size and position of a target relative to the individual based on age, allowing for precise determination of ophthalmic fatigue by assessing sharpness, with the option to insert corrective lenses and adjust the target's size or distance to determine if the lack of accommodation is due to fatigue or a more serious issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the target is gradually brought closer to the individual using the RAF rule, then the minimum accommodation distance can be measured, but the measurement is overestimated leading to prescription errors
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the target size and position based on the individual's age before the actual accommodation test. This preparation step establishes appropriate baseline parameters that account for age-related changes in accommodation, preventing the overestimation error that occurs when using fixed RAF rule parameters for all ages. The target is positioned at an age-appropriate distance and sized accordingly before the individual views it, ensuring accurate baseline measurement.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting both the size and position of the target according to the individual's age. Rather than using a fixed target distance and size as in the RAF rule, the system modifies these parameters based on age-specific accommodation characteristics. This allows the test to accurately reflect the individual's true accommodation capacity without the systematic overestimation error.
2Measurement precision
If the target size and position are adjusted based on age, then accurate detection of ophthalmic fatigue is achieved, but the device complexity increases
Solution Approach 1:
The patent uses preliminary action by pre-configuring age-appropriate target parameters before the actual fatigue assessment. The device is prepared with age-specific target sizes and positions stored or pre-determined, so that when an individual of a specific age undergoes testing, the appropriate parameters are already established. This reduces the complexity of real-time adjustments while maintaining high measurement precision.
Solution Approach 2:
The patent applies dynamics by making the target parameters (size and position) variable rather than fixed. The device dynamically adapts the target configuration based on the individual's age, allowing the same device to accurately test individuals across different age groups. This dynamic adjustment capability enables precise fatigue detection without requiring separate devices for each age group.
3Measurement precision
If corrective lenses are inserted to distinguish fatigue from serious issues, then diagnostic accuracy improves, but the procedure time increases
Solution Approach 1:
The patent applies preliminary action by first establishing the individual's age-appropriate baseline accommodation capacity before introducing corrective lenses. This preliminary assessment provides a reference point that accelerates the diagnostic process, as the clinician can quickly compare the effect of lens insertion against the known baseline rather than conducting a complete re-evaluation. The preliminary age-based parameter setting streamlines the overall procedure.
Solution Approach 2:
The patent implements feedback by using the individual's response to the target at different distances and with/without corrective lenses to rapidly determine diagnostic category. The feedback from the individual's ability to maintain clear vision at age-appropriate distances provides immediate information about accommodation status, allowing quick differentiation between fatigue and more serious conditions without prolonged testing.
Data Source
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AI summary
The invention relates to a method of screening a state of ophthalmic fatigue of an individual, comprising steps: a1 ) of positioning a target (120) in relation to the individual in such a way that the target is visible by at least one of the two eyes of the individual, a2) of assessment by the individual of the sharpness of the target, and a3) of deducing a state of ophthalmic fatigue of the individual depending on whether the target is seen by the individual in a sharp or blurred manner. According to the invention, prior to step a2), there is provision for a step a0) of adjusting the size of the target and/or the position of the target in relation to the individual, as a function of the age of the individual.