In situ oxygen transmissibility of rigid gas-permeable contact lenses.
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.
Weissman
B A
BA
Jules Stein Eye Institute, University of California School of Medicine, Los Angeles.
Fatt
I
I
D003261:Contact Lenses; D006801:Humans; D008433:Mathematics; D010100:Oxygen; D010539:Permeability; D013666:Tears / Q000502:physiology
D010100:Oxygen