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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 6 — Jun. 13, 2007

Designing a holographic modal wavefront sensor for the detection of static ocular aberrations

Alexander D. Corbett, Timothy D. Wilkinson, Jiang J. Zhong, and Luis Diaz-Santana  »View Author Affiliations

JOSA A, Vol. 24, Issue 5, pp. 1266-1275 (2007)

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The extent to which holographic modal wavefront sensing can be applied to the detection of ocular aberrations was investigated. First, the idea of extending the dynamic range of the sensor by increasing the mask bias and the collection area of the pinhole detectors used in the sensor is reviewed. Errors in the detection of single-mode aberrations owing to reduced coherence from retinal scattering, photon, readout, and quantization noise are evaluated. A sensitivity-to-noise metric is introduced to evaluate sensor designs and is found to be maximized by using a pinhole detector radius of 8.6 ( f λ N Δ ) for every wave of mask bias (where f = transform lens focal length, λ = wavelength , and N and Δ are the number and size of the hologram pixels, respectively). The problem of detecting ocular aberrations composed of multiple modes required a generalization of the sensitivity measure to include all incident aberration modes. A “detect and correct” ocular aberration detection scheme was implemented that reduced the effects of cross talk and showed a maximum sensitivity-to-noise ratio of 40, which varied inversely with the size of the ocular aberration being detected.

© 2007 Optical Society of America

OCIS Codes
(070.6110) Fourier optics and signal processing : Spatial filtering
(090.1970) Holography : Diffractive optics

ToC Category:
Instrumentation and Techniques for Retinal Imaging

Original Manuscript: August 18, 2006
Revised Manuscript: November 21, 2006
Manuscript Accepted: December 1, 2006
Published: April 11, 2007

Virtual Issues
Vol. 2, Iss. 6 Virtual Journal for Biomedical Optics

Alexander D. Corbett, Timothy D. Wilkinson, Jiang J. Zhong, and Luis Diaz-Santana, "Designing a holographic modal wavefront sensor for the detection of static ocular aberrations," J. Opt. Soc. Am. A 24, 1266-1275 (2007)

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