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Clinical application of the oxygen transmissibility of powered contact lenses

By Noel A. Brennan, Nathan Efron, Barry A. Weissman and Michael G. Harris

Abstract

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

Topics: 111300 OPTOMETRY AND OPHTHALMOLOGY, Contact Lenses, Hydrophilic, Oxygen/, analysis, Humans, Models, Biological, Optics, Research Support, Non, U, S, Gov't
Publisher: Contact Lens Association of Ophthalmologists
Year: 1991
OAI identifier: oai:eprints.qut.edu.au:3372
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