METHOD OF TREATMENT OF KERATOCONUS OF I-III STAGE (OPTIONS) Russian patent published in 2018 - IPC A61F9/08 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, specifically to ophthalmology. For the surgical treatment of keratoconus of I–III stage, incisions are made in the annular zone of the cornea with an outer diameter of 8–11 mm, an inner diameter of 5–6.5 mm, a length equal to the width of the annular zone, a depth equal to ¾ of the entire thickness of the cornea at the site of the incisions, with a distance of 60 mcm from the front surface of the cornea using a FemtoVizum femtolaser with the following parameters: a wavelength of 1,030–1,040 nm, a pulse duration of 300–400 fs, pulse repetition frequency is 1 MHz, pulse energy is 500–1,000 nJ, focus spot size is less than 2 mcm, maximum processing diameter is 10.5 mm, maximum processing depth is 1,100 mcm, after which UV cross-linking is performed. In the asymmetric form of ectasia in combination with myopia, 4–12 radial incisions are made at the same angular distance from each other. In the symmetric form of ectasia in combination with myopia, 4–12 radial cuts are made at the same angular distance from each other and four cuts, two cuts in each zone of ectasia, parallel and symmetrical to the strong meridian of the cornea, at a distance of 0.4–1.2 mm from it. With a symmetrical form of ectasia, four cuts are made, two cuts in each ectasia zone, parallel and symmetrical to the strong cornea meridian, at a distance of 0.4–1.2 mm from it. In the asymmetric form of ectasia, four cuts are made in the ectasia zone, two cuts on each side of the strong meridian of the cornea, parallel and symmetrical to it, at a distance of 0.4–1.2 mm from it and from each other. In the asymmetric form of ectasia and mixed astigmatism, four cuts are made in the zone opposite to ectasia, two cuts on each side of the strong cornea meridian parallel and symmetrical to it, at a distance of 0.4–1.2 mm from it and from each other.

EFFECT: group of inventions reduces intraoperative and postoperative complications, stabilizes the keratectatic process by flattening the cornea and changing its shape.

5 cl, 5 ex