Paraperm EW lens for extended wear
Key, J.E.; Mobley, C.L.
Clao Journal Official Publication of the Contact Lens Association of Ophthalmologists Inc 15(2): 134-137
1989
ISSN/ISBN: 0733-8902 PMID: 2720947 Document Number: 335329
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.