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

Ghosh, Atanu, Collins, Michael, Read, Scott, Davis, Brett, & Iskander, Robert (2011) Measurement of ocular aberrations in downward gaze using a modified clinical aberrometer. Biomedical Optics Express, 2(3), pp. 452-463.

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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.

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ID Code: 52526
Item Type: Journal Article
Refereed: Yes
DOI: 10.1364/BOE.2.000452
ISSN: 2156-7085
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000)
Australian and New Zealand Standard Research Classification > PSYCHOLOGY AND COGNITIVE SCIENCES (170000)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Deposited On: 19 Jul 2012 06:31
Last Modified: 12 May 2017 01:34

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