title: The durability of hydrogel extended-wear contact lenses worn for daily wear by USAF aircrew members.
abstract: Hydrogel extended-wear contact lenses, worn on a daily-wear regimen, were tested for 1 year by USAF aircrew members. A total of 62 eyes were fitted with Hydrocurve II (55% water content) spherical lenses, 29 with Hydrocurve II (55% water content) toric lenses, and 61 with CSI-T (38.5% water content) spherical lenses. The mean lens replacement rate for torn lenses per aircrew member was determined to be 1.45 lenses a year. The replacement rate of Hydrocurve II spherical lenses compared to CSI-T lenses was not statistically significant. However, the replacement rate for Hydrocurve II toric lenses was significantly lower than both Hydrocurve II spherical lenses and CSI-T lenses (p less than 0.01). The extended-wear lenses tested in this study appeared to be durable enough for the rigors of daily wear.
authors.affiliation: Aerospace Vision Laboratory, USAF School of Aerospace Medicine, Brooks AFB, TX 78235-5301.
authors.forename: R J
authors.initials: RJ
authors.lastname: Dennis
authors.forename: J R
authors.initials: JR
authors.lastname: Hill
authors.forename: N S
authors.initials: NS
authors.lastname: Ketchum
mesh_terms: D000328:Adult; D000337:Aerospace Medicine; D003262:Contact Lenses, Extended-Wear; D004868:Equipment Failure; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D008297:Male; D008422:Materials Testing; D011092:Polyethylene Glycols
chemical_list: D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D011092:Polyethylene Glycols