Synchronized Dual-Axis Eye Refraction Measurement
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Solution Overview
Problem
Current technologies face challenges in accurately determining the relative peripheral refraction of the eye, which is crucial for assessing refractive errors and personalizing spectacle lenses, especially for myopia control and sports lenses.
Innovation Solution
An optical device with synchronized first and second measurement channels is used to capture images of the eye. The first channel measures on-axis refraction, while the second channel measures off-axis refraction by directing lighting beams along axes separated by at least 10°, allowing for the calculation of relative peripheral refraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If off-axis lighting beams are used to measure peripheral refraction, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The optical device is divided into multiple independent measurement channels, each capable of generating and detecting light beams along different axes. This segmentation allows the system to measure both on-axis and off-axis refraction simultaneously using separate, standardized measurement units, thereby improving peripheral refraction measurement accuracy without requiring a completely new complex device architecture.
Solution Approach 2:
Each measurement channel is designed to be universal, capable of performing both on-axis and off-axis measurements by simply changing the beam direction. This multi-functionality reduces device complexity by using the same basic measurement unit for different measurement purposes, rather than requiring separate specialized devices for each measurement type.
2Productivity
If multiple measurement channels are used to capture on-axis and off-axis images simultaneously, then productivity is improved, but device complexity increases
Solution Approach 1:
Multiple measurement channels are merged into a single integrated optical device that can simultaneously perform on-axis and off-axis measurements. The channels share common components such as the eye model, detection system, and processing unit, allowing parallel measurement of different refraction types without requiring separate independent devices, thus improving productivity while controlling overall device complexity.
Solution Approach 2:
The system adds the dimension of simultaneous multi-axis measurement capability by introducing multiple measurement channels that operate in parallel. This dimensional expansion from single-channel sequential measurement to multi-channel parallel measurement significantly improves productivity by capturing both on-axis and off-axis refraction data at the same time.
3Measurement precision
If light beams are directed along axes separated by at least 10°, then measurement precision for peripheral refraction is improved, but ease of operation decreases
Solution Approach 1:
The optical device automatically performs the complex task of directing light beams along precisely separated axes and capturing images without requiring manual intervention. The system self-adjusts the beam directions and handles the image capture process, transforming a potentially complex manual operation into an automated procedure that maintains high measurement precision while improving ease of operation.
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 enables fast and comfortable determination of relative peripheral refraction, suitable for children and adaptable for mobile devices, providing accurate refractive error assessment and personalized lens customization.
Implementation Method 1
The pattern of light exiting the pupil is determined by the optics of the eye and the optomechanical characteristics of the camera of the photorefractive apparatus. This pattern is dominated by an examinee's refractive error (focusing errors of the eye).
Implementation Method 2
Some of the light from this retinal spot is returned out of the eye through the pupil after interaction with different layers of the eye. The pattern of light exiting the pupil is determined by the optics of the eye and the optomechanical characteristics of the camera of the photorefractive apparatus.
Data Source
AI summary
An optical device for capturing images of an eye of an individual, the optical device having a first measurement channel and a second measurement channel. The first measurement channel generates at least one first lighting beam directed toward the eye and along a first axis and to capture at least one first image of the eye when illuminated by the at least one first lighting beam. The second measurement channel is generates at least one second lighting beam directed toward the eye and along a second axis separated from the first axis by at least 5°, for example at least 10° or at least 20° and to capture at least one second image of the eye when illuminated by the at least one second lighting beam. The first measurement channel and the second measurement channel are synchronized together.