Eye Refractive Error Measurement Using Entrance Pupil Position
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Solution Overview
Problem
Existing methods for determining refractive errors of the eye, particularly at the near point, are inadequate in terms of accuracy, speed, and require the use of refractive correction glasses during measurement.
Innovation Solution
A computer-implemented method involving generating input data by changing the distance between the eye and a visual stimulus while recording the distance at which visual perception changes, considering the entrance pupil position to determine refractive errors accurately without the need for refractive correction glasses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing methods for determining refractive errors are used, then measurement can be performed, but accuracy is insufficient and the process is time-consuming
Solution Approach 1:
The patent replaces traditional mechanical refraction measurement devices with a mobile communication device that uses optical imaging and computer processing. The system captures images of the eye's reflection of an illumination pattern and uses image processing algorithms to determine refractive errors, eliminating the need for complex mechanical measurement apparatus and significantly reducing measurement time while improving accuracy.
Solution Approach 2:
The patent creates a digital copy of the eye's optical characteristics by capturing images of the illumination pattern reflection. Instead of direct mechanical measurement, the system creates an optical image copy that can be analyzed computationally to determine refractive errors, enabling fast and accurate measurement without physical contact or complex mechanical interaction.
2Ease of operation
If traditional refraction measurement methods are used, then refractive errors can be determined, but refractive correction glasses are required during measurement
Solution Approach 1:
The patent extracts and eliminates the requirement for refractive correction glasses from the measurement process. By using optical imaging of the eye's reflection and computational analysis, the system directly measures refractive errors without needing the patient to wear corrective lenses during measurement, simplifying the procedure and improving ease of operation.
Solution Approach 2:
The measurement system performs self-assessment of refractive errors by analyzing the optical characteristics of the eye itself. The eye's own optical properties are used to determine its refractive state without external assistance from corrective glasses, enabling independent and convenient measurement.
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
Provides a fast, easy, and accurate determination of refractive errors, including spherical power, cylindrical power, and cylinder axis, without the use of refractive correction glasses, and allows for precise production of spectacle lenses.
Implementation Method 1
displaying at least one illumination pattern to at least one eye of a person
Implementation Method 2
capturing at least one image picturing at least one reflection of the at least one illumination pattern illuminating at least one portion of the at least one eye of the person
Data Source
AI summary
A computer-implemented method for determining a refractive error of an eye of a person includes the following steps: a) generating input data containing a distance between the eye of the person and a visual stimulus displayed to the eye of the person and b) generating outcome data containing a refractive error of the eye of the person determined by evaluating the input data. A position of the entrance pupil of the eye of the person is considered when the refractive error of the eye of the person is determined. A computer program, a field device, a remote device, a determining device, a method for producing a geometrical model of a spectacle lens, and a method for producing a spectacle lens are also disclosed. The present disclosure provides a fast, easy, versatile, reliable, and accurate approach for determining a refractive error of an eye of a person.