Peripheral ocular aberrations in mild and moderate keratoconus
Atchison, David A., Mathur, Ankit, Read, Scott A., Walker, Mitchell, Newman, Alexander, Tanos, Photios, McLennan, Roderick, & Tran, Andrew (2010) Peripheral ocular aberrations in mild and moderate keratoconus. Investigative Ophthalmology & Visual Science.
Purpose: To investigate the influence of keratoconus on peripheral ocular aberrations.
Methods: Aberrations of 7 mild and 5 moderate keratoconics were determined over a 42°horizontal x 32° vertical visual field with a modified COAS-HD aberrometer. Control data
were obtained from an emmetropic group.
Results: Most aberrations in keratoconics showed field dependence predominately along the vertical meridian. Mean spherical equivalent M, oblique astigmatism J45 and regular
astigmatism J180 refraction components and total root mean square aberrations (excluding defocus) had high magnitudes in the inferior visual field. The rates of change of aberrations were higher in moderate than in mild keratoconics. Coma was the dominant peripheral higher-order aberration in both emmetropes and keratoconics; for the latter it had high magnitudes in the centre and periphery of the visual field.
Conclusion: Greater rates of change of aberrations across the visual field occurred for the keratoconic groups than for the emmetropic control group. Moderate keratoconics had more rapid changes in, and higher magnitudes of aberrations across the visual field than mild keratoconics. The dominant higher-order aberration for the keratoconics across the visual field was vertical coma.
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|Item Type:||Journal Article|
|Keywords:||Coma, Keratoconus, Peripheral Aberrations, Visual field|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
|Copyright Owner:||Copyright 2010 Association for Research in Vision and Ophthalmology|
|Deposited On:||05 Nov 2010 08:23|
|Last Modified:||01 Mar 2012 00:27|
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