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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 2, Iss. 3 — Mar. 1, 2011
  • pp: 452–463

Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer

Atanu Ghosh, Michael J Collins, Scott A Read, Brett A Davis, and D. Robert Iskander  »View Author Affiliations

Biomedical Optics Express, Vol. 2, Issue 3, pp. 452-463 (2011)

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Changes in corneal optics have been measured after downward gaze. However, ocular aberrations during downward gaze have not been previously measured. A commercial Shack-Hartmann aberrometer (COAS-HD) was modified by adding a relay lens system and a rotatable beam splitter to allow on-axis aberration measurements in primary gaze and downward gaze with binocular fixation. Measurements with the modified aberrometer (COAS-HD relay system) in primary and downward gaze were validated against a conventional aberrometer. In human eyes, there were significant changes (p<0.05) in defocus C(2,0), primary astigmatism C(2,2) and vertical coma C(3,−1) in downward gaze (25 degrees) compared to primary gaze, indicating the potential influence of biomechanical forces on the optics of the eye in downward gaze. To demonstrate a further clinical application of this modified aberrometer, we measured ocular aberrations when wearing a progressive addition lens (PAL) in primary gaze (0 degree), 15 degrees downward gaze and 25 degrees downward gaze.

© 2011 OSA

OCIS Codes
(330.4460) Vision, color, and visual optics : Ophthalmic optics and devices
(330.5370) Vision, color, and visual optics : Physiological optics
(330.7327) Vision, color, and visual optics : Visual optics, ophthalmic instrumentation

ToC Category:
Vision, Color, and Visual Optics

Original Manuscript: December 1, 2010
Revised Manuscript: January 25, 2011
Manuscript Accepted: January 26, 2011
Published: February 1, 2011

Atanu Ghosh, Michael J Collins, Scott A Read, Brett A Davis, and D. Robert Iskander, "Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer," Biomed. Opt. Express 2, 452-463 (2011)

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