Post radial keratotomy RGP fitting--a case study.

The procedure of radial keratotomy produces an abnormal corneal topography, with the central cornea being flatter than the periphery. As a result, fitting the post-radial keratotomy (RK) patient with rigid gas permeable (RGP) lenses can be an enormously difficult task. Unlike standard lens designs, the Ortho-K series of lenses, originally designed for use in orthokeratology, possess a back peripheral radius (BPR) which is steeper than the back optic zone radius (BOZR). It is proposed that these lenses may provide a more acceptable fit than conventional RGPs for the post-RK patient.