A keratoconus fitting system using the axial profile to establish optimum lens parameters.

This paper describes the application of a fitting system for keratoconus defined according to the integrated configuration of the optic and periphery, referred to as the axial profile. Incremental steps are arithmetic for a given total diameter across the range necessary for keratoconus and increased or decreased by varying the back optic zone radius (BOZR) and the axial edge lift (AEL) in combination, or by retaining a constant BOZR and reducing the AEL. An introductory section discusses selection of initial rigid trial corneal contact lenses for keratoconus and arrival at an optimum end point to the fitting process.