The effect of altering spherical aberration on the static accommodative response

Theagarayan, Baskar Pitty and Radhakrishnan, Hema and Allen, Peter M. and Calver, Richard I. and Rae, Sheila M. and O'Leary, Daniel J. (2009) The effect of altering spherical aberration on the static accommodative response. Ophthalmic and Physiological Optics: the journal of the British College of Ophthalmic Opticians (Optometrists). ISSN 1475-1313

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Abstract

PURPOSE To investigate the effect of altering the spherical aberration (SA) of the eye on the static accommodative response. METHODS: Participants were fitted with nominally afocal contact lenses with controlled amounts of SA of either -0.2, -0.1, 0.0, +0.1 or +0.2 microm for a 5-mm pupil. Measurements of SA and root mean square (RMS) total aberration for the eye plus lens for each participant were determined with a Complete Ophthalmic Analysis System aberrometer. Accommodation was stimulated either by placing targets at different dioptric distances from the eye, or by using a fixed distance target and placing negative-powered lenses in front of the eye. Accommodation responses were determined with a Shin-Nippon autorefractor. RESULTS: For both stimuli situations, the slope of the accommodation stimulus-response function was lowest for the lenses with +0.2 microm SA, and increased as the amount of SA was reduced. There was a significant negative correlation between SA and slope. Lag of accommodation at 33 cm correlated well with added SA, but did not correlate with total RMS error. There was no significant difference between the responses at 30 min after lens wear started and the responses after 1 h. CONCLUSIONS: Adding negative SA to the eye generally improves the slope of the accommodation stimulus-response curve and decreases lag of accommodation, and positive added SA depresses the slope of the stimulus-response curve and increases lag. The effect seems to be specific to SA, as there was no relationship between lag and RMS error. Altering SA may be a viable way of changing accommodative functions in clinical situations.

Item Type: Journal Article
Additional Information: Citation: Theagarayan, B. et al., 2009. The effect of altering spherical aberration on the static accommodative response. Ophthalmic and Physiological Optics, 29(1), pp.65-71..
Faculty: Faculty of Science & Technology
Depositing User: Mr I Walker
Date Deposited: 28 Mar 2013 10:23
Last Modified: 30 Jun 2017 09:39
URI: http://arro.anglia.ac.uk/id/eprint/276316

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