FIELD: medicine.
SUBSTANCE: invention relates to medicine. Laser system for ophthalmic surgeries controls received images and includes the following: a laser-beam system, including: laser engine, configured to generate the beam of laser pulses; beam attenuator, configured to modify the laser-power parameter of the laser pulses, wherein the laser-power parameter is one of a pulse energy, a pulse power, a pulse length and a pulse repetition rate; and a beam scanner, configured to direct the beam of laser pulses to the points of the scan-pattern in the eye; and a laser controller acting on the basis of the obtained images. At that, the laser controller is configured to: image a layer in the eye, which is inclined relative to the optical axis of the laser system, determine a z-depth coordinate of the points sequence in a cylindrical capsulotomy image, which corresponds to displayed eye layer, generate a tracking band within the cylindrical capsulotomy image defining the cut to be made in an eye, herewith, the lower border of the tracking band has non-uniform z-depth coordinate, which varies in accordance with measured z-depth coordinates for points sequence corresponding to the displayed layer; prescription for the beam scanner to scan pulsed laser beam by the points of the cylindrical capsulotomy image, and instructions for the beam attenuator to control the parameter of pulse laser power such that the parameter of pulse laser power in the tracking band could be above a photodisruption threshold, and the parameter of pulse laser power outside of the tracking band could be below the photodisruption threshold.
EFFECT: using the invention enables to increase accuracy in performing fragmentation of lens.
29 cl, 12 dwg
