Paraperm® EW lens for extended wear

James Key, C. L. Mobley

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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°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.

Original languageEnglish (US)
Pages (from-to)134-137
Number of pages4
JournalCLAO Journal
Issue number2
StatePublished - Jan 1 1989

ASJC Scopus subject areas

  • Ophthalmology


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