Patient responses to gas-permeable hard (Polycon) contact lenses.

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.

• Authors: M D Sarver, K A Polse, M G Harris
• Journal: American journal of optometry and physiological optics (Am J Optom Physiol Opt) Vol. 54 Issue 4 Pg. 195-200 (Apr 1977) ISSN: 0093-7002 [Print] United States
• PMID: 910867 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Methylmethacrylates
• Silicones
• polycon
• Oxygen

Topics

• Adolescent
• Adult
• Consumer Behavior
• Contact Lenses (adverse effects)
• Cornea (anatomy & histology)
• Corneal Diseases (etiology)
• Edema (etiology)
• Female
• Humans
• Male
• Methylmethacrylates (adverse effects)
• Middle Aged
• Oxygen
• Permeability
• Refractive Errors (rehabilitation)
• Silicones (adverse effects)