This is an essential tool for the practice of Orthokeratology and to produce custom made Gas Permeable Contact lenses for abnormally shaped corneas. The instrument produces a plot of your cornea describing the shape of your cornea extremely accurately. It is now possible to match the back curve of the contact lens to that of your cornea producing a lens of optimumt, with the Topograph, Special software and an elaborate manufacturing process. This instrument will also pick up abnormally shaped corneas. Example – Keratoconus