CONTACT LENS WITH SHAPED PERIPHERY

摘要

Eye measurements taken on a patient being fitted for contact lens will inclu de a refraction test and an additional measurement representing corneal depth variation on the surface of an imaginary cylinder having the same diameter a s the lens. This information then used during lens manufacture to produce lens in which the perimeter is not circular and does not lie in a plane, but whic h drops backwards towards the eye at appropriate points to produce a saddle- shaped perimeter.