METHOD OF SURGICAL CORRECTION OF MYOPIC ASTIGMATISM Russian patent published in 2010 - IPC A61F9/01 B82B3/00 

FIELD: medicine.

SUBSTANCE: invention relates to field of ophthalmology and can be used for surgical correction of myopic astigmatism. Cornea is influenced by layer-by-layer ablation with pulse irradiation of non-scanning excimer laser with Gauss radial space distribution of energy density in transverse section of ray. Wavelength is 193-250 nm, diametre of laser impact zone 5-9 mm, pulse duration 15-30 ns, pulse recurrence rate 5-15 Hz. Influence is performed by successive reduction of parametre of mean square deviation of energy density distribution in each of next pulse series is within the interval from 2.7 to 1.8 mm. Value of amplitude of energy density in centre of pulse symmetry is within the interval from 100 mJ/sq cm to 175 mJ/sq cm and remains constant during all time of pulse series carrying out. Each pulse series forms concave with respect to initial cornea surface ellipsoidal surfaces located on one axis. Zone of exposure is symmetrical relative to optic centre of cornea symmetry. Position of weak axis of astigmatism is determined and large axis of formed ellipsoidal surfaces is superimposed with it.

EFFECT: method allows to reduce eye tissue trauma with simultaneous reduction of post-operation complications and volume of ablated eye tissues.

2 ex, 3 dwg, 2 tbl