Apparatus for laser surgery and particularly for the keratotomy of the cornea (III)

Claim 1

Eye surgery apparatus for controlling the application of a laser beam on tissue of a cornea to perform keratotomy of the cornea, said apparatus comprising: a slit diaphragm disposable between a laser beam source and a cornea to be operated on, said slit diaphragm including a control slit through which the laser beam passage along an optical device during surgery, and optical rotary means diposed between the slit diaphragm and the cornea for accommodating controlled movement of the laser beam impact position on the cornea, whereby optimum laser beam power can be directed at the diaphragm control slit during surgical operation; and wherein the optical rotary means includes a prism formed from two parts, said prism including an entrance face and an exit face, said entrance face and exit face being at right angles to the optical axis, three reflecting surfaces totally reflecting the beam and having normals forming an angle of 67.5° , 90° , and 125.5° with the optical axis respectively, and two passage faces between the two parts through which the laser beam passes at right angles.