An apparatus for maintaining a patient's visual fixation and centration while marking the patient's cornea comprises a housing, a light source axially aligned and integral to the housing to maintain the patient's visual fixation and centration while the cornea is marked with the light source acting as...http://www.google.fr/patents/US5013319?utm_source=gb-gplus-shareBrevet US5013319 - Apparatus and method for cornea marking
