Corneal Gas Permeable Contact Lenses Estimated Quantity: Individual Lenses. Corneal gas permeable contact lenses are small rigid surface contact lenses that are custom designed for each individual patient. They must be able to be customized to the individual patient in terms of base curve, diameter, power, material, thickness, lens color, and peripheral recesses. Scleral Gas Permeable Contact Lenses Estimated Quantity: Individual Lenses. Scleral gas permeable contact lenses are large rigid surface contact lenses that are custom designed, and computer lathed for each individual patient. They must be able to be customized to the individual patient in terms of base curve, vault, power, material, lens color, thickness, peripheral recesses, limbal clearance, landing zone configurations, and having coating options.
