Adaptive Optics Aberration Correction for Eye Movement
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Solution Overview
Problem
Current optical imaging methods using adaptive optics systems require a long time to correct aberrations in the eye, leading to potential eye movement during imaging, which disrupts the correction process and results in delayed high-resolution image acquisition.
Innovation Solution
An optical imaging method and apparatus with an adaptive optics system that includes an aberration measuring unit, correcting unit, and adjusting unit to quickly correct aberrations and maintain correction characteristics even when the eye moves, using a deformable mirror and Shack-Hartmann wavefront sensor for precise aberration measurement and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is performed to correct aberration, then aberration correction accuracy is improved, but the time required to establish correction increases
Solution Approach 1:
The system pre-calculates and stores correction amounts for various eye positions before imaging begins. When the eye is at a new position, the corresponding pre-calculated correction amount is immediately applied without requiring real-time feedback iteration, thus reducing the time to establish correction while maintaining accuracy
Solution Approach 2:
The system dynamically adjusts the correction strategy based on eye position detection. When eye movement is detected, the system switches from standard feedback control to a mode that applies pre-calculated corrections corresponding to the new eye position, making the correction process adaptive to dynamic conditions
2Productivity
If imaging operation is performed, then image acquisition is achieved, but eye movement causes displacement from desired imaging position
Solution Approach 1:
The system continuously detects eye position during imaging and uses this feedback to determine when the eye has returned to the original position. This enables the system to resume imaging only when positioning accuracy is restored, maintaining reliable imaging despite temporary eye movements
Solution Approach 2:
The system pauses imaging operations when eye movement is detected, preventing acquisition of misplaced images. This preliminary anti-action avoids wasting imaging time on displaced positions and prepares the system to resume imaging when the eye returns to the correct position
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 reduces the time required to achieve accurate aberration correction, allowing for immediate resumption of imaging upon eye return to the original position, ensuring high-resolution fundus images can be obtained without significant delay.
Implementation Method 1
the wavefront is measured by causing measurement light to be incident on the eye and receiving light reflected by the eye with a CCD camera through a microlens array
Implementation Method 2
a high-resolution image can be obtained by driving components such as a deformable mirror and a spatial phase modulator so as to correct the measured wavefront
Data Source
AI summary
An adaptive optics apparatus includes an aberration measuring unit that measures an aberration caused by a subject's eye, the aberration being measured on the basis of returning light that returns from the subject's eye; an aberration correcting unit that performs aberration correction in accordance with the aberration measured by the aberration measuring unit; an irradiation unit that irradiates the subject's eye with light corrected by the aberration correcting unit; and an adjusting unit that maintains a correction characteristic of the aberration correcting unit when the subject's eye moves out of a predetermined area.