Optacryl® 60 (kolfocon A) rigid gas permeable contact lenses for daily wear are available as lathe cut firm contact lenses withspherical anterior and posterior surfaces. The posterior curve is selected so as to properly fit an individual eye and the anterior curve isselected to provide the necessary optical power to correct refractive error. A peripheral curve system on the posterior surface allowstear exchange between the lens and the cornea.The Optacryl® 60 rigid gas permeable contact lens material is a thermoset copolymer derived from siloxane and methylmethacrylate.The lens material is available in blue, green, or gray versions. The blue lens contains Microlith Blue 4 G-K; the green lens containsSunfast Green No. 7; and, the gray lens contains D&C Green No. 6, D&C Violet No. 2, and Perox Yellow No. 9 as the color additives.
A prefabricated (non-customized) rigid ophthalmic lens intended to be worn directly against the cornea of the eye to correct refractive vision conditions (e.g., myopia, hyperopia, astigmatism, presbyopia); it is designed to be removed prior to sleeping each night. The device is made of various materials (e.g., cellulose acetate butyrate, polyacrylate-silicone, silicone elastomers) whose main polymer molecules generally do not absorb or attract water but permit diffusion of oxygen (O2) to the ocular surface. This is a reusable device.