title: Paraperm EW lens for extended wear.
abstract: This paper reports the results of 372 patients fit with the Paraperm EW rigid gas permeable lens for extended wear. This lens material is a copolymer derived from siloxane and methylmethacrylate with an oxygen permeability (Dk) of 56 X 10(-11) at 37 degrees C. At the end of 1 year, 270 patients had completed the study with 94.8% achieving 20/25 or better vision. Complications included a 12.3% incidence of superficial limbal keratitis with staining, a 3.1% incidence of conjunctival injection, and a 1.5% incidence of observable corneal edema. The lens appears to be a significant addition to the possibilities available for fitting extended wear patients or those who desire occasional overnight lens wear.
authors.forename: J E
authors.initials: JE
authors.lastname: Key
authors.forename: C L
authors.initials: CL
authors.lastname: Mobley
mesh_terms: D003262:Contact Lenses, Extended-Wear / Q000009:adverse effects; D003315:Cornea / Q000378:metabolism; D003316:Corneal Diseases / Q000517:prevention & control; D004487:Edema / Q000517:prevention & control; D005260:Female; D006801:Humans; D008297:Male; D008768:Methylmethacrylates / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D012833:Siloxanes / Q000378:metabolism; D014792:Visual Acuity
chemical_list: D008768:Methylmethacrylates; D012833:Siloxanes; D010100:Oxygen