Clinical application of the oxygen transmissibility of powered contact lenses

Brennan, Noel A., Efron, Nathan, Weissman, Barry A., & Harris, Michael G. (1991) Clinical application of the oxygen transmissibility of powered contact lenses. The CLAO journal : official publication of the Contact Lens Association of Ophthalmologists, 17(3), pp. 169-172.


Stipulation of the oxygen transmissibility (Dk/L) of a contact lens based upon oxygen permeability (Dk) and nominal lens thickness (L) can be misleading since center thickness, average thickness, and hence Dk/L of a contact lens vary with lens power. While earlier confusion regarding determination of Dk has now been resolved, this data has yet to be fully incorporated into a clinically applicable model. We developed a graphical solution describing variations in Dk/L with power for a representative sample of currently available hydrogel and rigid contact lenses. The Dk/L is found to be optimal for lenses of low minus power (approximately -2.50 D). The model presented here will assist practitioners in assessing the potential oxygen performance of different lens designs with respect to a given power. We advocate that lens manufacturers print the average Dk/L on lens packaging, according to the model described in this paper, along with the parameters that are usually stated.

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ID Code: 3372
Item Type: Journal Article
Refereed: Yes
Additional Information: For more information, please refer to the journal’s website (see link) or contact the author. Author contact details:
Additional URLs:
Keywords: Contact Lenses, Hydrophilic, Oxygen/, analysis, Humans, Models, Biological, Optics, Research Support, Non, U, S, Gov't
ISSN: 0733-8902
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 Contact Lens Association of Ophthalmologists
Deposited On: 17 Feb 2006 00:00
Last Modified: 10 Aug 2011 13:21

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