Eye Refraction Measurement Using Color Temperature Adjustment
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Solution Overview
Problem
Existing devices for detecting optical quality of the eye, such as autorefractors and aberrometers, face challenges in accurately measuring refractive errors and astigmatism due to interference from non-relevant reflections and the need for additional light sources, which can obscure measurement data.
Innovation Solution
The method involves capturing images of the eye using a device that adjusts for color temperature and blocks non-relevant reflections, analyzing the intensity of different colors within the pupil to determine refractive errors and astigmatism without the need for external light sources, utilizing a computing device to process pixel values and calculate autorefraction results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external light sources are used to illuminate the eye for measurement, then the optical quality detection can be performed, but non-relevant reflections from the lens and corneal surface obscure the measurement data
Solution Approach 1:
The patent extracts and removes the harmful corneal reflections from the measurement field by using a matte black surface to block reflected light before it reaches the sensor. This separates the useful retinal reflection signal from the harmful corneal reflection interference, allowing accurate measurement without the obscuring reflections.
Solution Approach 2:
The patent introduces a matte black surface as an intermediary element between the eye and the sensor. This intermediary blocks the harmful corneal reflections while allowing the useful retinal reflection to pass through, mediating between the light source and the sensor to eliminate interference.
2Measurement precision
If color temperature adjusted lighting is used, then accurate determination of refractive errors and astigmatism is achieved, but the complexity of the measurement system increases
Solution Approach 1:
The patent changes the color temperature parameter of the lighting to match the ambient lighting conditions (e.g., 6504K for daylight, 3000K for incandescent). This parameter adjustment allows the system to accurately measure refractive errors and astigmatism by compensating for color casting effects while maintaining system simplicity through software-based control.
3Device complexity
If ambient lighting conditions are used instead of controlled light sources, then the device complexity is reduced, but the color temperature variations affect measurement accuracy
Solution Approach 1:
The patent makes the lighting system dynamic by adjusting the color temperature to match the ambient lighting conditions. The system detects the ambient color temperature and dynamically adapts the LED lighting to match, ensuring consistent measurement accuracy across different lighting environments while maintaining device simplicity.
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 approach allows for accurate determination of refractive errors and astigmatism by analyzing the intensity differences within the pupil, providing a reliable method for estimating prescriptions and detecting the presence and amount of astigmatism without external light interference.
Implementation Method 1
detecting light reflected out of an eye of a subject from a retina of the eye of the subject
Data Source
AI summary
Disclosed herein are methods and apparatus for making a determination about an eye comprising detecting light reflected out of an eye of a subject from a retina of the eye of the subject and making a determination about the eye of the subject based upon the reflected light, wherein the light is adjusted for color temperature when making the determination about the eye.