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Pubmed for Handhelds

PUBMED FOR HANDHELDS

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  • Title: Patient responses to gas-permeable hard (Polycon) contact lenses.
    Author: Sarver MD, Polse KA, Harris MG.
    Journal: Am J Optom Physiol Opt; 1977 Apr; 54(4):195-200. PubMed ID: 910867.
    Abstract:
    Forty-six patients who were unable to wear polymethylmethacrylate (PMMA) contact lenses, owing mainly to corneal edema and associated symptoms, were fitted with gas-permeable hard Polycon lenses of the same dimensions. Thirty-one patients (67%) wore the POLYCON lenses successfully. Thirteen (28%) did not, because of discomfort. For 2 patients, the results were unknown. None of the 46 patients exhibited observable edema with the POLYCON lenses. For a group of 5 patients (10 eyes), mean corneal thickness change after 8 hr of lens wear was insignificant. Oxygen transmissibility of these lenses is approximately 5.0 X 10(-11) (cm2 X ml O2)/(sec X ml X mm Hg), a value less than that for hydrogel lenses which produce more edema. It is predicted that gas-permeable hard lenses will eventually replace PMMA lenses.
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