Vision Testing System for Axial Myopia Correction
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Solution Overview
Problem
Current refractive measuring devices struggle to accurately determine refractive properties of the eye, particularly in cases of axial myopia, due to inaccurate measurements and influencing factors, which can lead to overcorrection and undesirable eye growth in children, necessitating more precise evaluation and correction methods.
Innovation Solution
A vision testing system incorporating a first interferometric measuring device, a second topographic measuring device, and a third refractive measuring device, along with a processing means, to measure central and peripheral axial lengths, corneal curvature, and refractive properties, allowing for precise data editing and output, enabling improved optical corrections without cycloplegia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a refractive measuring device is used to determine refraction value, then the refraction value can be objectively determined in diopters, but the measurement may be inaccurate due to eye accommodation at close range and other influencing factors
Solution Approach 1:
The invention segments the refraction measurement into two distinct components: central refraction (on the visual axis) and peripheral refraction (in the peripheral retina region). By using separate measurement approaches for each region, the system accurately captures the different refractive properties without interference from accommodation effects, thereby resolving the contradiction between measurement precision and reliability.
Solution Approach 2:
The invention introduces an intermediary approach by measuring peripheral refraction through the pupil margin rather than directly in the central visual axis. This intermediary measurement method bypasses the accommodation influence that affects central measurements, providing a more reliable reference point for determining true refractive error.
2Measurement precision
If axial myopia is corrected with glasses or contact lenses to shift the focal plane onto the retina, then the macula region is properly focused, but the peripheral region becomes overcorrected with the focal plane shifted behind the retina
Solution Approach 1:
The invention applies local quality by prescribing different refractive corrections for different regions of the retina. Central refraction determines the base prescription for macular focus, while peripheral refraction measurements identify regions requiring reduced correction power. This localized differentiation ensures proper central vision correction while preventing harmful peripheral overcorrection that promotes eye growth.
Solution Approach 2:
The invention uses partial action by applying full correction only in the central visual axis region and reduced or modified correction in the peripheral regions. This partial correction approach in the periphery prevents the focal plane from being shifted too far behind the retina, thereby avoiding the harmful effect of promoting excessive eye growth while maintaining central visual acuity.
3Measurement precision
If peripheral fixation is used to measure peripheral axial length, then the visual axis can be inclined to reach peripheral retina, but the measurement setup becomes more complex
Solution Approach 1:
The invention applies dynamics by making the fixation target movable and adjustable in position and orientation. The fixation means can dynamically reposition targets to different locations (central or peripheral) and adjust the visual axis inclination angle, allowing the measurement system to adapt to different measurement requirements without requiring multiple fixed measurement setups, thereby managing complexity while maintaining precision.
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
This system provides more comprehensive and accurate refractive data, allowing for better evaluation and selection of optical corrections, potentially slowing the progression of axial myopia by shifting the focal cup in front of the retina, thus preventing overcorrection and promoting healthy eye growth.
Implementation Method 1
a first interferometric measuring device (11), in particular a partial coherence interferometer, being configured to measure a central axial length and a peripheral axial length of an eye (16)
Implementation Method 2
a second topographic measuring device (12), in particular a keratometer, being configured to measure a curvature of the cornea (35) of the eye (16)
Data Source
AI summary
A method for testing the eyes of a test person with the aid of a vision testing system as well as to a vision testing system, comprising a first measuring device, a second topographic measuring device, a third refractive measuring device and a processing means, a central axial length (LZ) and a peripheral axial length (LP) of an eye of the test person being measured with the aid of said first measuring device, a curvature of the cornea of the eye being measured with the aid of said second measuring device, a refractive property of the eye being measured with the aid of said third measuring device, measurement data of the measurements of the first, second and third measuring device being processed with the aid of said processing means, said processing means outputting the measurement data.