Adaptive Optics Wavefront Correction for Ocular Aberrations
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Solution Overview
Problem
Current optical imaging apparatuses with adaptive optics systems face limitations in correcting aberrations caused by optical tissues like the cornea and lens, leading to reduced high-resolution imaging capabilities and decreased imaging sensitivity, with users unable to accurately assess aberration correction and select appropriate resolutions for individual eyes.
Innovation Solution
An adaptive optics system comprising an aberration measuring unit, correcting unit, irradiation unit, and acquiring unit that measures and corrects aberrations based on returning light, allowing for optimal image acquisition at appropriate resolutions tailored to the subject's eye, using a deformable mirror or spatial phase modulator for wavefront correction and Shack-Hartmann wavefront sensors for measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the NA of the laser is increased to increase the resolution, then the resolution is improved, but the amount of aberration caused by optical tissues increases
Solution Approach 1:
The wavefront aberration is measured before the imaging operation using a Shack-Hartmann wavefront sensor, and the aberration is corrected in advance using a deformable mirror or spatial phase modulator. This preliminary correction enables high-resolution imaging by eliminating the harmful aberration effects before they degrade the image quality.
Solution Approach 2:
The system uses a feedback mechanism where the wavefront sensor continuously measures the aberration caused by optical tissues, and this measurement is used to adjust the deformable mirror or spatial phase modulator to correct the aberration. This closed-loop feedback ensures that the resolution improvement from increased NA is not compromised by aberration.
2Measurement precision
If the aberration cannot be appropriately corrected, then the high-resolution imaging capability is reduced, but the imaging sensitivity decreases
Solution Approach 1:
The system performs preliminary wavefront measurement and aberration correction before the imaging operation to ensure that the imaging conditions are optimized in advance, preventing both resolution degradation and sensitivity loss.
Solution Approach 2:
The system changes the wavefront parameters using a deformable mirror or spatial phase modulator to correct the aberration, thereby maintaining both the resolution and sensitivity of the imaging system by optimizing the wavefront shape before imaging.
3Measurement precision
If the user evaluates the state of correction from an obtained image, then the appropriateness of correction can be assessed, but the process requires skill and time
Solution Approach 1:
The Shack-Hartmann wavefront sensor provides real-time feedback on the wavefront aberration, allowing the system to objectively assess the correction state without requiring user skill or time-consuming image evaluation. The feedback mechanism automatically determines whether the aberration has been appropriately corrected.
Solution Approach 2:
The system replaces the manual skill-based image evaluation process with an automated optical measurement system (Shack-Hartmann wavefront sensor) that objectively measures wavefront aberration and determines correction adequacy, eliminating the need for user expertise and reducing evaluation time.
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
Enables high-resolution imaging by effectively correcting aberrations and improving imaging sensitivity, allowing users to determine the appropriateness of aberration correction and selecting optimal resolutions, thereby enhancing the quality of ocular-fundus images.
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
Implementation Method 3
an adaptive optics (AO) system, which is an adaptive optics system for measuring and correcting an aberration of the eye
Data Source
AI summary
An adaptive optics apparatus includes an aberration measuring unit that measures an aberration caused by a test object, the aberration being measured on the basis of returning light that returns from the test object; 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 test object with light corrected by the aberration correcting unit; and an acquiring unit that acquires information based on a transmittance of the test object on the basis of the aberration measured by the aberration measuring unit.