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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 27, Iss. 11 — Nov. 1, 2010
  • pp: A37–A47

System design considerations to improve isoplanatism for adaptive optics retinal imaging

Phillip Bedggood and Andrew Metha  »View Author Affiliations


JOSA A, Vol. 27, Issue 11, pp. A37-A47 (2010)
http://dx.doi.org/10.1364/JOSAA.27.000A37


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Abstract

Adaptive optics (AO) retinal images are limited by anisoplanatism; wavefront shape varies across the field of view such that only a limited area can achieve diffraction-limited image quality at one time. We explored three alternative AO modalities designed to reduce this effect, drawn from work in astronomy. Optical design analysis and computer modeling was undertaken to predict the benefit of each modality for various schematic eyes and various complexities of the imaging system. Off-axis performance was found to be limited by system parameters and not by the eye itself, due to the inherent off-axis characteristics of the eye’s gradient index lens. This rendered the alternative AO modalities ineffectual compared with conventional AO but did suggest several methods by which anisoplanatism may be reduced by altering the design of conventional AO systems. Several of these design possibilities were explored with further modeling. The best-performing method involved the replacement of system lenses with gradient index versions inspired by the human eye lens. Mirror-based relay optics also demonstrated good off-axis performance, but their advantage was lost in regions of the system suffering from uncorrected higher-order aberration. Incorporating “off-the-plane” beam deviations ameliorated this loss substantially. In this work we also show, to our knowledge for the first time, that the ideal location of a single AO corrector need not lie in the pupil plane.

© 2010 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(110.2760) Imaging systems : Gradient-index lenses
(170.4460) Medical optics and biotechnology : Ophthalmic optics and devices
(080.4035) Geometric optics : Mirror system design

History
Original Manuscript: January 19, 2010
Revised Manuscript: June 4, 2010
Manuscript Accepted: June 13, 2010
Published: July 20, 2010

Virtual Issues
Vol. 6, Iss. 1 Virtual Journal for Biomedical Optics

Citation
Phillip Bedggood and Andrew Metha, "System design considerations to improve isoplanatism for adaptive optics retinal imaging," J. Opt. Soc. Am. A 27, A37-A47 (2010)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-27-11-A37

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