METHOD OF SURGICAL CORRECTION OF MYOPIA Russian patent published in 2009 - IPC A61F9/01 B82B3/00 

FIELD: medicine.

SUBSTANCE: invention relates to field of ophthalmosurgery. Cornea is influenced by layer-by-layer ablation with pulse irradiation of non-scanning excimer laser with Gauss radial distribution of energy density in transversal section of ray. Exposure is carried out by successive reduction of parametre of mean-square deviation of energy density distribution in each of following pulse series within the interval from 2.3 mm to 1.8 mm. Value of energy density amplitude in centre of pulse symmetry, which is within the interval from 175 mJ/sq.cm to 100 mJ/sq.cm is also successively reduced with each following pulse series. Within each pulse series values of parametres of mean-square deviation of energy density distribution and energy density amplitude are constant. Each pulse series forms concave relative to initial cornea surface spherical surfaces, located on one axis, and zone of exposure is symmetrical relative to optic centre of cornea symmetry. Ratio of diametre of first concave spherical surface to diametre of cornea is within the interval from 0.6 to 0.8. Ratio of diametre of second spherical surface to diametre of first spherical surface is within the interval from 0.8 to 0.95. Ratio of diametre of third spherical surface to diametre of second spherical surface is within the interval from 0.8 to 0.95. Cornea surface is exposed to irradiation of excimer laser with wave length 193-250 nm, with diametre of laser impact zone from 5 to 9 mm, pulse duration 15-30 ns, pulse recurrence rate from 5 to 15 Hz.

EFFECT: method ensures reduction of eye tissue traumas with simultaneous reduction of post-operative complications and volume of removed eye tissues.

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