METHOD FOR DETERMINING DIFFERENTIATED INDICATIONS TO LASER CORRECTION OF IRGREGULAR CORNEA ASTIGMATISM AFTER POSTINFECTIOUS OPACIFICATIONS Russian patent published in 2017 - IPC A61F9/07 A61F9/01 A61B3/103 A61B8/10 

FIELD: medicine.

SUBSTANCE: in order to determine the indications of a differentiated approach to conducting and choosing the method of refractive surgical correction of irregular cornea astigmatism after postinfectious opacifications of the cornea, the patient initially undergoes autorefractometry and visometry with correction and without it to determine the spherical and cylindrical components of refraction. Using the method of optical coherence tomography, the central thickness of the cornea and the depth of opacity in the optical zone in mcm are measured. A corneal topography study is performed on the keratotopograph to determine keratotopographic indices: surface regularity index (SRI) and surface asymmetry index (SAI). If the SRI is more than 1.0 and the SAI is more than 0.5, the central thickness of the cornea is more than 450 microns, the depth of the cornea opacity is not more than 65% of the central thickness of the cornea, then at the magnitude of the myopic refractive component greater than 1 dioptre (D), a transepithelial topographically oriented photorefractive keratectomy (TTPRK) is carred out, with the initial topographically oriented ablation in the zone with 6.0 mm diametre and subsequent ablation of the corneal surface congruently with the removal of epithelial remains in the zone with 6.0 mm diametre, with a residual thickness of the corneal stroma not less than 300 mcm, and at the hypermetropic refractive component greater than 1 D, intraocular correction of hypermetropy is performed with the calculation of the target myopic refractive component from 2 to 3 D and after stabilisation of the refractive result TTPRK is carried out by the above mentioned method.

EFFECT: allows to achieve satisfactory visual and functional rehabilitation of patients after surgical correction of refractive disorders due to the use of a differentiated approach.

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