Corneal optics and near visual tasks
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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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal's website (see hypertext link) or contact the author.|
|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|
|Last Modified:||22 Apr 2010 02:56|
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