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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|Item Type:||Journal Article|
|Additional Information:||For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: firstname.lastname@example.org|
|Keywords:||Contact Lenses, Hydrophilic, Oxygen/, analysis, Humans, Models, Biological, Optics, Research Support, Non, U, S, Gov't|
|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|
|Last Modified:||10 Aug 2011 23:21|
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