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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 2, Iss. 7 — Jul. 16, 2007

Population study of the variation in monochromatic aberrations of the normal human eye over the central visual field

Matthew T. Sheehan, Alexander V. Goncharov, Veronica M. O’Dwyer, Vincent Toal, and Christopher Dainty  »View Author Affiliations

Optics Express, Vol. 15, Issue 12, pp. 7367-7380 (2007)

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We present data analysis for ocular aberrations of 60 normal eyes measured with a Hartmann-Shack (HS) wavefront sensor (WFS). Aberration measurements were made on-axis and at 5 degree field angles in the nasal, inferior, temporal and superior semi-meridians. Particular attention is given to aberration distributions and possible strategies for aberration correction are discussed. A versatile HS WFS was designed and constructed with features of simultaneous pupil centre determination, off-axis capability, real-time data displays, and efficient lenslet sampling orientation. The subject alignment is achieved by the use of a parallel channel that is recombined with the sensing channel to simultaneously image the eye and the HS spots onto a single CCD. The pupil centre is determined using this image of the eye (iris edge), rather than the HS spots. The optical design includes a square lenslet array positioned with its diagonals aligned with the most typical principal astigmatic meridians of the eye. This favourable orientation helps to enlarge the dynamic range of the WFS. The telecentric re-imaging of the HS spots increases the robustness of the system to defocus in the event of CCD misalignment.

© 2007 Optical Society of America

OCIS Codes
(010.1080) Atmospheric and oceanic optics : Active or adaptive optics
(170.4460) Medical optics and biotechnology : Ophthalmic optics and devices
(330.5370) Vision, color, and visual optics : Physiological optics
(330.7310) Vision, color, and visual optics : Vision

ToC Category:
Vision and color

Original Manuscript: April 3, 2007
Revised Manuscript: May 10, 2007
Manuscript Accepted: May 25, 2007
Published: May 31, 2007

Virtual Issues
Vol. 2, Iss. 7 Virtual Journal for Biomedical Optics

Matthew T. Sheehan, Alexander V. Goncharov, Veronica M. O'Dwyer, Vincent Toal, and Christopher Dainty, "Population study of the variation in monochromatic aberrations of the normal human eye over the central visual field," Opt. Express 15, 7367-7380 (2007)

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