Ophthalmic Tomography with Dual-Range Scanning and Distortion Correction
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Solution Overview
Problem
Existing ophthalmic devices face challenges in acquiring tomographic images of different eye segments with high correlation due to distortions and displacements caused by varying curvatures, thicknesses, and refractive indexes, and require complex processing to correct these issues, especially when simultaneous scanning is attempted.
Innovation Solution
An ophthalmic device with a first and second light source, interferometers, and a controller that performs a simultaneous scan in the same plane to calculate and correct distortions in tomographic images, allowing for accurate acquisition of images in overlapping optical paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate scanning is used for anterior segment and fundus, then distortion correction is simpler, but measurement accuracy decreases due to eye state changes
Solution Approach 1:
The patent combines the scanning of anterior segment and fundus into a single simultaneous scanning process using a unified optical path. The light source and optical system scan both regions in the same scan coordinate system, eliminating the need for complex post-processing alignment and distortion correction between separately acquired images.
2Measurement precision
If simultaneous scanning is used with same optical path, then measurement accuracy improves, but scanning wide range becomes difficult
Solution Approach 1:
The patent transitions from separate two-dimensional scanning planes for anterior segment and fundus to a unified three-dimensional scan coordinate system. This allows the light to scan both regions simultaneously along the same optical path while maintaining accurate spatial correlation across different depths and positions within the eye.
3Measurement precision
If different scanning configurations are used for anterior segment and fundus, then each region can be optimized, but coordinate system displacement occurs
Solution Approach 1:
The patent employs a universal scanning configuration where the same light source and optical path are used for both anterior segment and fundus scanning. This multi-functional approach allows a single scanning system to serve multiple purposes, eliminating the need for separate telecentric and concentric scan systems while maintaining measurement accuracy through unified coordinate system management.
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
The device achieves high-correlation tomographic images by correcting distortions in both anterior segment and fundus images, reducing complexity and improving measurement accuracy.
Implementation Method 1
first interference light obtained from reflected light of the first light
Implementation Method 2
first interferometer configured to acquire a first tomographic image of a first range of the subject eye based on first interference light
Data Source
AI summary
An ophthalmic device includes a first light source configured to output first light, a second light source configured to output second light, a first interferometer configured to acquire a first tomographic image of a first range based on first interference light, a second interferometer configured to acquire a second tomographic image of a second range based on second interference light, and a controller. The controller may be configured to perform a specific scan on a subject eye that scans the first light and the second light simultaneously in a same plane, wherein the first tomographic image and the second tomographic image are obtained by performing the specific scan, calculate an amount of distortion of the first tomographic image, correct the first tomographic image based on the amount of distortion, and correct the second tomographic image based on the amount of distortion.