Rigid contact lens design: effects of overall diameter changes on tear pump efficiency

Fink, Barbara A., Carney, Leo G., & Hill, Richard M. (1991) Rigid contact lens design: effects of overall diameter changes on tear pump efficiency. Optometry and Vision Science, 68(3), pp. 198-203.



The effects of rigid contact lens overall diameter changes on tear pump efficiency were studied for lenses of 7 overall diameters (8.2 to 10.0 mm in 0.3-mm steps) while maintaining all other parameters (including a 7.4-mm optic zone diameter) constant. Oxygen uptake rates were measured in the normal, open eye and after static (without blinking) and dynamic (with blinking once every 5 s) wear of oxygen-impermeable (polymethyl methacrylate) contact lenses. Differences between uptake rates obtained under static vs. dynamic conditions served as an index of tear pump efficiency for each lens. Tear pump efficiency increased with the use of progressively smaller lens diameters and subjects with large palpebral aperture sizes were also found to have better tear exchange (r = 0.934, p = 0.006 for the 9.1-mm overall diameter reference lens).

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15 citations in Scopus
4 citations in Web of Science®
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ID Code: 3199
Item Type: Journal Article
Refereed: Yes
Additional Information: l.carney@qut.edu.au
Additional URLs:
Keywords: Contact Lenses, Oxygen Consumption, Tears/, metabolism, Adult, Blinking/physiology, Cornea/metabolism, Humans, Methylmethacrylates, Middle Aged, Polarography, Prosthesis Design, Statistics
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 1991 The American Academy of Optometry
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 13 Jul 2006 00:00
Last Modified: 09 Jun 2010 12:29

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