Indications
• An alternative to Rigid Gas Permeable lenses for fitting keratoconic eyes.
• For all stages of the disease, but most often employed in advanced keratoconus when the patient
has failed to tolerate RGP lenses or RGP lenses are scarring the cornea.
• Often succeeds when RGP/Soft lens combinations fail.

Description
The posterior surface of the lens consists of a steep central curve, flatter para-central curve, and a final peripheral curve. All curves are aspheric with the central curve computed by a complex polynomial formula; it approximates hyperbolic aspheres in larger sagittal depths. The para-central curve is similar in design to the base curve of a standard soft lens and the 8.6 mm. radius curve with a 14.8 mm. diameter should fit the majority of eyes.

The anterior surface has a central optical portion, which quickly tapers to thinner flange curve to maximize oxygen to the cornea. It has about the same total lens mass as a standard high plus soft lens. When residual astigmatism indicates that a toric lens is needed, double slab-off ballasting is used to stabilize lens rotation.