Refractive Error Measurement Using Entrance Pupil Position
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Solution Overview
Problem
Existing methods for determining refractive errors of the eye are not fast, easy, versatile, reliable, and accurate, often requiring refractive correction glasses and lacking precise meridian-based distance measurements.
Innovation Solution
A computer-implemented method using a screen to display visual stimuli while changing the distance between the eye and the stimulus, recording the distance at which visual perception changes, and determining refractive error based on entrance pupil position, without requiring refractive correction glasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods for determining refractive errors are used, then refractive correction glasses are required, but the process becomes complex and less accurate
Solution Approach 1:
The patent extracts and eliminates the requirement for refractive correction glasses from the measurement process. By using a screen displaying visual stimuli at varying distances and recording the distance at which visual perception changes, the method determines refractive error without needing corrective lenses, thereby simplifying the measurement system while maintaining or improving accuracy
Solution Approach 2:
The patent replaces the mechanical/optical system of refractive correction glasses with a computational approach. Instead of using physical lenses to correct vision during measurement, the system uses a screen to display stimuli and algorithms to calculate refractive error based on the recorded distance where visual perception transitions occur
2Productivity
If refractive correction glasses are used during measurement, then measurement can be performed, but the process is not fast and easy
Solution Approach 1:
The patent enables the measurement system to be self-sufficient by eliminating the need for external refractive correction glasses. The system uses its own components (screen displaying visual stimuli and distance recording mechanism) to directly determine refractive error, making the process faster and easier by removing the step of fitting and adjusting corrective lenses during measurement
3Measurement precision
If distance measurement without meridian-based precision is used, then measurement is simpler, but measurement precision is reduced
Solution Approach 1:
The patent applies local quality by implementing meridian-based distance measurement. Instead of using a single overall distance measurement, the system measures distances along different meridians (directions) from the entrance pupil to the screen. This localized measurement approach along specific meridians provides higher precision distance data that accounts for the directional nature of refractive errors in the eye
Data Source
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AI summary
The present invention relates to a computer-implemented method (200) for determining at least one refractive error of an eye (302) of a person (300), the method comprising the following steps: a) generating input data (202) configured to comprise at least one distance (110) between the eye (302) of the person (300) and at least one visual stimulus (108) displayed to the eye (302) of the person (300) and b) generating outcome data (204) configured to comprise at least one refractive error of the eye (302) of the person (300), wherein the at least one refractive error of the eye (302) of the person (300) is determined by evaluating the input data, wherein a position of the entrance pupil (304) of the eye (302) of the person (300) is considered when the at least one refractive error of the eye (302) of the person (300) is determined. The present invention further relates to a computer program, a field device (400), a remote device (402), a determining device (100), a data carrier signal (406), a method for producing a geometrical model of at least one spectacle lens and a method for producing at least one spectacle lens. The present invention provides a fast, easy, versatile, reliable and accurate approach for determining at least one refractive error of an eye (302) of a person (300).