The Relationship Between Peripheral Corneal Flattening As Measured By The Keratometer vs. The EyeSys Corneal Topographer.

For many years practitioners of orthokeratology have used the rule that greater reduction
in myopia may be achieved on eyes that have greater peripheral flattening of the cornea. They estimated peripheral corneal flattening by taking keratometer readings at two points on the cornea. The first point was the central corneal curvature measured in the standard manner, with the patient fixating on the central target of the keratometer. The second point was taken while the patient fixated on the nasal plus mire. In this position the keratometer was measuring curvature at a point on the temporal cornea.