Correcting highly aberrated eyes using large-stroke adaptive optics.
OBJECTIVE
To investigate the optical performance of a large-stroke deformable mirror in correcting large aberrations in highly aberrated eyes.


METHODS
A large-stroke deformable mirror (Mirao 52D; Imagine Eyes) and a Shack-Hartmann wavefront sensor were used in an adaptive optics system. Closed-loop correction of the static aberrations of a phase plate designed for an advanced keratoconic eye was performed for a 6-mm pupil. The same adaptive optics system was also used to correct the aberrations in one eye each of two moderate keratoconic and three normal human eyes for a 6-mm pupil.


RESULTS
With closed-loop correction of the phase plate, the total root-mean-square (RMS) over a 6-mm pupil was reduced from 3.54 to 0.04 microm in 30 to 40 iterations, corresponding to 3 to 4 seconds. Adaptive optics closed-loop correction reduced an average total RMS of 1.73+/-0.998 to 0.10+/-0.017 microm (higher order RMS of 0.39+/-0.124 to 0.06+/-0.004 microm) in the three normal eyes and 2.73+/-1.754 to 0.10+/-0.001 microm (higher order RMS of 1.82+/-1.058 to 0.05+/-0.017 microm) in the two keratoconic eyes.


CONCLUSIONS
Aberrations in both normal and highly aberrated eyes were successfully corrected using the large-stroke deformable mirror to provide almost perfect optical quality. This mirror can be a powerful tool to assess the limit of visual performance achievable after correcting the aberrations, especially in eyes with abnormal corneal profiles.
Sabesan
Ramkumar
R
Institute of Optics University of Rochester, Rochester, NY 14627, USA. ramkumar@optics.rochester.edu
Ahmad
Kamran
K
Yoon
Geunyoung
G
D006801:Humans; D007640:Keratoconus / Q000150:complications; D055095:Optics and Photonics / Q000295:instrumentation*; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000209:etiology / Q000503:physiopathology* / Q000628:therapy*; D012720:Severity of Illness Index; D016896:Treatment Outcome