Eye Sensitivity Determination via Adjustable Refraction Target
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Solution Overview
Problem
Conventional methods for determining the sensitivity of an eye for customizing spectacle lenses are complex, prone to measurement uncertainty, and have a negative psychological impact on test subjects, as they require multiple refraction adjustments and visual tasks with suboptimal corrections.
Innovation Solution
A method that projects a target with adjustable refraction into the eye to determine visual acuity limiting refraction, allowing for the calculation of sensitivity independent of predefined refraction values, using a sensitivity metric that considers spherical and cylindrical corrections, enabling rapid and simple sensitivity determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used to determine eye sensitivity with multiple refraction adjustments and visual tasks, then measurement accuracy can be improved, but device complexity and measurement time increase significantly
Solution Approach 1:
The patent extracts the essential measurement information by determining only the visual acuity limiting refraction at a single predetermined visual acuity level, removing the need for multiple refraction adjustments and complex visual tasks. This extraction of the critical parameter simplifies the measurement procedure while maintaining the ability to calculate sensitivity through the sensitivity metric.
Solution Approach 2:
The method performs preliminary determination of the visual acuity limiting refraction at a predetermined visual acuity level before calculating sensitivity. By establishing this baseline measurement first, the patent eliminates the need for subsequent complex adjustments and multiple visual tasks, streamlining the overall measurement process.
2Reliability
If conventional methods with multiple refraction adjustments are applied, then sensitivity measurement reliability can be improved, but loss of time increases due to complex procedures
Solution Approach 1:
The patent extracts only the essential measurement data needed for sensitivity determination by focusing on the visual acuity limiting refraction at a single predetermined visual acuity level. This extraction eliminates time-consuming multiple refraction adjustments and complex visual tasks while maintaining measurement reliability through the sensitivity metric calculation.
3Loss of information
If conventional sensitivity determination methods are used, then comprehensive eye data can be obtained, but ease of operation deteriorates due to negative psychological impact on test subjects
Solution Approach 1:
The patent extracts the critical sensitivity information by determining only the visual acuity limiting refraction at a predetermined visual acuity level, removing the need for multiple refraction adjustments and complex visual tasks that cause psychological stress. This streamlined approach maintains information completeness while significantly improving test subject comfort and ease of operation.
Data Source
AI summary
A method for determining the sensitivity of at least one eye of a test subject based on at least two provided pairs of values for visual acuity and refraction, wherein at least one of the pairs of values for visual acuity and refraction. The method includes: projecting a target with an adjustable target refraction into the at least one eye of the test subject, wherein the target is configured to verify a predetermined visual acuity; and determining a visual acuity limiting refraction of the at least one eye of the test subject associated with the predetermined visual acuity by varying the target refraction of the target projected into the at least one eye of the test subject and detecting a test subject action which results in a determination that the identifiability of the target for the test subject has changed at the time of the test subject action.