Microkeratome and method of performing corneal resections

Abstract

A microkeratome and related surgical methods for performing lamellar keratotomies are provided. The microkeratome includes a guide ring assembly for placement on the eyeball, or ocular globe such that the globe's cornea protrudes therethrough. The guide ring can be temporarily fixed to the ocular globe, immobilizing the eyeball relative to the instrument. A cutting blade suitable for corneal resections is carried in a cutting head over the guide ring through a cutting path defined by the guide ring. An adjustable float head, also generally known as a plaque, is connected to the cutting head for at least partially compressing the cornea ahead of the blade, so as to set the desired thickness of the corneal resection. The cutting head and float head can be driven across the guide ring, whereby the blade cuts at least partially through the cornea to perform the lamellar keratotomy. Various surgical corrections are obtainable through the use of arcuate and oblique plaques, as an alternative to planar plaques or float heads, where appropriate.