January 1972
Volume 11, Issue 1
Free
Articles  |   January 1972
Permeability of Hydrophilic Contact Lenses
Author Affiliations
  • DENNIS R. MORRISON
    Department of Ophthalmology, University of Florida, Gainesville, Fla., and the Medical College of Wisconsin, Madison, Wis.
  • HENRY F. EDELHAUSER
    Department of Ophthalmology, University of Florida, Gainesville, Fla., and the Medical College of Wisconsin, Madison, Wis.
Investigative Ophthalmology & Visual Science January 1972, Vol.11, 58-63. doi:
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      DENNIS R. MORRISON, HENRY F. EDELHAUSER; Permeability of Hydrophilic Contact Lenses. Invest. Ophthalmol. Vis. Sci. 1972;11(1):58-63.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Oxygen permeability and water diffusion characteristics were determined for several types of hydroxyethyl-methacrylate hydrophilic contact lenses and a silicone contact lens material. A two- to fourfold difference in the diffusion rates for capillary flow of water was found among the different hydrophilic lenses. Oxygen permeability studies demonstrate that the hydrophilic lenses are capable of transmitting many times more than the calculated amount of dissolved oxygen in the capillary water flow if an oxygen partial pressure gradient exists across the lens. The silicone contact lens will transmit oxygen more than four times faster than will the most permeable hydrophilic lens; however, the silicone lens is almost totally impermeable to water and ostensibly impermeable to tears.

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