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Related Experiment Video

Updated: Jul 9, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

Correcting highly aberrated eyes using large-stroke adaptive optics.

Ramkumar Sabesan¹, Kamran Ahmad, Geunyoung Yoon

¹Institute of Optics University of Rochester, Rochester, NY 14627, USA. ramkumar@optics.rochester.edu

Journal of Refractive Surgery (Thorofare, N.J. : 1995)

|November 29, 2007

Summary

A large-stroke deformable mirror effectively corrected significant eye aberrations, achieving near-perfect optical quality. This adaptive optics technology shows promise for assessing visual limits in eyes with irregular corneas.

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Area of Science:

Ophthalmology
Optical Engineering
Biomedical Optics

Background:

Highly aberrated eyes, such as those with keratoconus, present challenges for achieving high visual acuity.
Accurate correction of ocular aberrations is crucial for understanding and potentially improving visual performance limits.

Purpose of the Study:

To evaluate the effectiveness of a large-stroke deformable mirror in correcting substantial optical aberrations in simulated and real eyes.
To assess the optical performance of an adaptive optics system utilizing this mirror for highly aberrated eyes.

Main Methods:

An adaptive optics system incorporating a large-stroke deformable mirror (Mirao 52D) and a Shack-Hartmann wavefront sensor was employed.
Closed-loop correction was performed on a phase plate simulating advanced keratoconus and on the eyes of individuals with moderate keratoconus and normal vision.

Main Results:

The deformable mirror reduced root-mean-square (RMS) aberrations from 3.54 to 0.04 micrometers in a simulated keratoconic eye within 3-4 seconds.
In normal eyes, total RMS aberrations decreased from 1.73 to 0.10 micrometers; in keratoconic eyes, they reduced from 2.73 to 0.10 micrometers.

Conclusions:

The large-stroke deformable mirror successfully corrected significant aberrations in both normal and highly aberrated eyes, achieving excellent optical quality.
This technology is valuable for evaluating the maximum achievable visual performance, particularly in eyes with abnormal corneal shapes.