Disposable extended wear lenses are currently manufactured via two processes. Bausch & Lomb utilizes the conventional spincast method while the Johnson & Johnson lens is produced via a stabilized soft molding process with the lens in a hydrated state. These two processes result in distinctly different lens edge designs. To determine if the differences in lens edge design would result in any signficant conjunctiva! trauma, sixty subjects were fitted with a Johnson & Johnson lens in one eye and a Bausch & Lomb lens in the other eye. After wearing these lenses for a period of 24 hours, evaluation for staining was performed with sodium fluorescein and a Wratten filter. A Wilcoxon test for nonparametric data showed that the Johnson & Johnson lens was responsible for significantly more conjunctiva! staining at an alpha level less than .001.
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