Eye Pattern Frequency Modulation for Remote Refraction Accuracy
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Solution Overview
Problem
There is a need for improved systems and methods to provide effective and accurate vision care diagnostics to remotely situated patients, particularly addressing uncorrected refractive errors and myopia, which are often inaccurately screened using conventional depth of focus assessments that can lead to over-prescription and rapid myopia progression.
Innovation Solution
The Oli-Eye PFM system/method employs depth of field assessment using visual acuity charts and algorithms to calculate refractive states by adjusting the relative positions of the patient and chart until the focal length equals the distance to the chart, allowing for accurate determination of sphere, axis, and cylinder power, and can be conducted at a fixed work distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional depth of focus assessment is used for remote vision screening, then the screening can be performed remotely with simple equipment, but the measurement precision is poor leading to over-prescription and inaccurate refractive error detection
Solution Approach 1:
The patent replaces conventional mechanical/optical focus assessment with a field modulation technique that uses frequency-modulated optical fields. The eye pattern frequency modulation method substitutes traditional focus-based measurement with a field-based approach that measures refractive error through frequency shifts in the optical field, achieving higher precision without requiring complex mechanical focusing mechanisms.
Solution Approach 2:
The patent changes the measurement parameter from focus distance to field frequency modulation characteristics. By modulating the optical field frequency and analyzing the eye's response at different frequencies, the system can determine refractive error with higher precision. This parameter transformation allows accurate measurement without the limitations of conventional focus assessment.
2Measurement precision
If depth of field assessment with field modulation is used, then measurement precision improves for refractive error detection, but the system complexity and algorithm processing requirements increase
Solution Approach 1:
The patent uses a simplified optical field model that copies the essential characteristics of light interaction with the eye without requiring full physical complexity. By creating a computational model of the eye's optical response to field modulation, the system can accurately determine refractive error through algorithmic processing of frequency shift data, reducing the need for complex physical measurement apparatus.
3Reliability
If conventional refraction instruments are used for remote screening, then the system is simple to operate, but the reliability is poor due to accommodative spasms causing pseudo-myopia and over-prescription
Solution Approach 1:
The patent employs periodic field modulation at multiple frequencies to assess refractive error. By presenting frequency-modulated optical fields at varying rates and analyzing the eye's periodic response, the system can distinguish between true refractive error and transient accommodative responses. This periodic measurement approach reduces the impact of accommodative spasms and pseudo-myopia, improving prescription reliability.
Solution Approach 2:
The system incorporates feedback mechanisms where the measured frequency response is continuously analyzed and used to adjust subsequent measurements. The algorithm processes the eye's response to field modulation in real-time, providing feedback that helps distinguish between accommodative responses and true refractive error, thereby improving the reliability of the final prescription while maintaining operational simplicity through automated processing.
Data Source
AI summary
Systems and methods for delivering effective and accurate vision care diagnostics to remotely situated patients are provided. The patient/system users may be in distinct geographic locations. A diagnostic assessment may be performed by using a depth of field assessment. The chart (or computer monitor displaying a chart) and the person may move or be moved relative to each other until the focal length of the refractive error of the eye equals the distance to the chart. The refraction systems/methods can also be conducted at a specific fixed work distance instead of moving the chart(s) relative to the person or the person relative to the chart(s). In such implementations, an algorithm associated with the disclosed system/method is adjusted to calculate the refractive state of sphere, axis and cylinder power by size of the subtended angle in relationship to the distance to the chart.