[Orthokeratology. Technique - possibilities - limits (author's transl)]

The vornea is because of its refraction, its structure and accessibility the easiest variable component of the optic eye system. Flat fitted, barely flexible contact lenses exercise by their small central clearance a considerable pressure on the corneal apex and will therefore bring about a reversible clearance of the central corneal topography. Orthokeratology therapeutically uses this effect in order to temporarily reducing, changing or eliminating a refractive error. This is of a particular interest in the case of a keratoconus. Orthokeratology is not without danger because too high pressures have a weekening effect on the corneal trophic and resistance.