Astigmatism correcting laser surgical set

The wide application of the laser surgery set for treating myopic, hypermetropic and mixed astigmatism is due to the shaper controlling the distribution of radiation energy density in the cross section of the u.v. beam of the pulsed laser. The shaper is made up with the optical cuvette exhibiting windows in the path of the laser beam, and which are set for turning around the beam axis. Their inside surfaces are second order cylinders with principal direction perpendicular to the beam axis. The cuvette is filled with a medium which partially transmits the laser radiation. The medium is circulated and means are provided for controlling the optical density of the medium. The eye surgery is preceded by the computation of the absorptivity of the medium (10) in the optical cuvette (7) for determining the angles between the principal direction of the windows (8,9). This aligns the bisectrix of the angle with one of the astigmatic angle of max. refraction of the eye. The beam of the laser (1) passes through the window (8) with uniform energy distribution density of its cross section and traverses through the medium (10) to exit through the window (9). The beam reaches the cornea after the traverse through the diaphragm (4) and lens (5), to remove a given layer from the cornea by photoablation.