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Influence of palpebral aperture height on tear pump efficiency

Fink, Barbara A., Carney, Leo G., & Hill, Richard M. (1990) Influence of palpebral aperture height on tear pump efficiency. Optometry and Vision Science, 67(4), pp. 287-290.

Abstract

Oxygen uptake rates were measured on 6 human corneas fitted with a standardized rigid contact lens in order to determine the relation between vertical palpebral aperture height and exchange efficiency of tears in such systems. The contribution provided by tear exchange to the oxygen available to the cornea was isolated through the use of lenses of negligible transmissivity (PMMA). Measurements of corneal oxygen uptake were made on the normal open eye, after 5 min of static (with no blinking) open eye contact lens wear, and after 5 min of dynamic (with blinking every 5 s) contact lens wear. The difference between the oxygen demand associated with static conditions (SC's) and that associated with dynamic conditions (DC's) is an index of the tear pump efficiency for each subject. A statistically significant correlation (p less than 0.0001) was found between the vertical palpebral aperture height and the tear bulk-flow of oxygen to the cornea, confirming that small palpebral apertures can restrict lens motion.

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2 citations in Web of Science®

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ID Code: 3197
Item Type: Journal Article
Additional Information: l.carney@qut.edu.au
Additional URLs:
Keywords: Contact Lenses, Oxygen Consumption, Cornea/, metabolism, Eyelids/, anatomy & histology, Tears/, metabolism, Adult, Blinking, Equipment Design, Female, Humans, Male, Methylmethacrylates
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1990 American Academy of Optometry
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 13 Jul 2006
Last Modified: 09 Jun 2010 22:29

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