title: In situ oxygen transmissibility of rigid gas-permeable contact lenses.
abstract: On the eye a contact lens is bathed in tear fluid, which increases its resistance to oxygen flux. For rigid gas-permeable lenses, this effect should be small during open-eye wear because a large amount of oxygen is provided by air-saturated tears that are pumped under the lens. However, under closed-eye conditions this study suggests substantial decrease in overall lens system oxygen transmissibility when lens transmissibility itself is greater than 20 x 10(-9) cm ml O2/s ml mm Hg and when the average thickness of the tear layer is greater than about 20 micron.
authors.affiliation: Jules Stein Eye Institute, University of California School of Medicine, Los Angeles.
authors.forename: B A
authors.initials: BA
authors.lastname: Weissman
authors.forename: I
authors.initials: I
authors.lastname: Fatt
mesh_terms: D003261:Contact Lenses; D006801:Humans; D008433:Mathematics; D010100:Oxygen; D010539:Permeability; D013666:Tears / Q000502:physiology
chemical_list: D010100:Oxygen