Fremgangsmåte og innretning for fotoablasjon av cornea med en laserstråle

摘要

The invention relates to a method for the photoablation of the cornea (24) with a laser beam (21), which includes a multitude of subsequent partial ablation steps. According to the inventive method, the thickness of the cornea is determined with a Michelson interferometer associated measuring device before and after every partial ablation step. Said measuring device uses the determined thickness values and guides the laser beam across the cornea in a controlled manner, using the intensity values adjusted by the measuring device and conforming with a predefined cornea profile, so that cornea thickness does not fall below a predefined value. The measuring device uses a Michelson interferometer with a central wave length of the measure beam source in the range of 1310 nm and a monomode fiber for said wavelength in the reference arm so as to completely compensate for the optical path in air within said measuring arm.