Corneal optics and near visual tasks

Collins, Michael J. & Buehren, Tobias F. (2005) Corneal optics and near visual tasks. In 11th Scientific Meeting in Optometry, 27–28 September 2005, Queensland University of Technology, Brisbane, Australia.


Aim: Our aim was to study the effect of performing some common near visual tasks on corneal topography. Methods: We investigated the relative changes in corneal optics in a group of nine young subjects who undertook three different near visual tasks for 60 minutes. One task was reading a novel in downward gaze, the second task required the use of a binocular microscope and the third task involved using a desktop computer. Corneal topography was collected before and after the 60-minute tasks and used to derive corneal refractive power and wavefront coefficients. In a second experiment we studied the recovery of corneal topography following periods of reading ranging from 10 to 120 minutes with six young subjects. Results: Each of the three near visual tasks showed systematic and statistically significant effects on both the characteristics (p < 0.05) and location (p = 0.01) of corneal topographic changes. The pattern of regression of topographic changes following the various reading times was similar, with a rapid recovery in the first 10 minutes followed by a slower regression lasting up to three hours after 120 minutes of reading (repeated measures ANOVA, p < 0.001). Discussion: The optical characteristics of the cornea can be altered by eyelid pressure following common near visual tasks and these effects can persist for many hours.

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ID Code: 12124
Item Type: Conference Paper
Refereed: Yes
Additional Information: Abstract published in Clinical and Experimental Optometry, 89(2), p. 109
Additional URLs:
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Divisions: Current > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2006 Blackwell Publishing
Deposited On: 18 Jan 2008 00:00
Last Modified: 03 Nov 2014 05:58

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