Contemporary orthokeratology.

Orthokeratology is the temporary reduction or elimination of myopia and astigmatism with rigid contact lenses having a tetra-curve reverse geometry back surface design are currently utilised for this purpose. The essential features of this construction are described. Those clinical characteristics which are favourable, and those which are unfavourable, for the technique of orthokeratology are listed. Reverse geometry lenses can either be fitted empirically or by the use of diagnostic lenses. Videokeratoscopy is of value in identifying corneal distortion induced by problems such as poor centration.