Regression of Lid-Induced Corneal Topography Changes After Reading

, , , , & Lingelbach, Bernd (2005) Regression of Lid-Induced Corneal Topography Changes After Reading. Optometry and Vision Science, 82(9), pp. 843-849.

Description

Purpose. The purpose of this article is to investigate the magnitude of lid-induced corneal topography changes as a function of time spent reading and the subsequent time course of regression of these changes. Methods. Six young subjects, five myopes and one emmetrope with normal ocular health, participated in the study. Corneal topography of one eye was measured with videokeratoscopy before four reading sessions of 10, 30, 60, and 120 min duration performed on four separate mornings. Corneal topography was again measured at fixed intervals up to 180 min after each reading session. A control trial without reading was also performed on a separate morning. Results. All six subjects showed significant changes in corneal topography directly after each of the reading sessions. Longer reading periods caused larger corneal changes. Local instantaneous power changes reached up to 5.95 D (+/- 2.80 D), whereas refractive power changes in the superior cornea ranged up to 1.26 D (+/- 0.44) for the 120-min reading trial. The duration of regression of corneal changes showed slower recovery times after longer reading periods. The pattern of regression was similar for all reading times, showing a rapid recovery within the first 10 minutes followed by a slower regression period. Conclusions. The length of time spent reading has a cumulative effect on the period over which corneal topography remains altered as a result of lid forces.

Impact and interest:

23 citations in Scopus
19 citations in Web of Science®
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ID Code: 2826
Item Type: Contribution to Journal (Journal Article)
Refereed: Yes
ORCID iD:
Collins, Michaelorcid.org/0000-0001-5226-5498
Measurements or Duration: 7 pages
Keywords: Corneal Topography, Lid Force, Myopia, Reading
ISSN: 1040-5488
Pure ID: 34298573
Divisions: Past > QUT Faculties & Divisions > Faculty of Health
Copyright Owner: Consult author(s) regarding copyright matters
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Deposited On: 31 Jan 2006 00:00
Last Modified: 24 Jun 2024 21:51