METHOD FOR POSTOPERATIVE INTRASTROMAL CORNEAL SEGMENTS CORRECTION Russian patent published in 2019 - IPC A61F9/01 A61F9/07 A61F9/08 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, specifically to ophthalmology. For position correction of postoperative intrastromal cornea segments, repeated position analysis of segments is performed on digital marking device VerionTM Image Guided System. Further, in operating conditions, focusing on the projection marks in the microscope eyepiece LuxOR LX3 and the graduated corneal circle scale projected onto the corneal image on the microscope monitor, real-time estimation of actual position of segment or segments and compliance of their position with respect to design values. If there is a difference between the actual and calculated position of the segment or segments of more than 5 angular degrees, the position of the segment or segments is corrected by forming an additional intrastromal tunnel in the projection of a previously formed femtosecond laser. Tunnel is programmed at depth of 80 % of the minimum thickness of the cornea in the area of the proposed resection; incision into the tunnel is planned at distance of 20 angular degrees from the edge of the segment at location of 1st and at equal distance from the edges of the corneal segments with arrangement of 2 segments. Focusing on the projection mark in the eyepiece of the microscope corresponding to the axis of the prospective incision, using a marker on the surface of cornea 2 points are applied along the projection mark in 2 and 3 mm from the limb. Femtosecond laser is centered along the axis of the future incision marked by a marker. After the corneal femtorepression is performed, the tunnel is inserted and the segment or segments are positioned according to the preoperative calculation, by moving the segment or segments within the intraastromal tunnel, until the edge of the segment or segments coincides with the projection mark corresponding to the design position of the segment or segments.

EFFECT: method provides precise reposition of intra-stromal corneal segments along a given meridian, reduced corneal astigmatism, improved visual acuity without correction and visual acuity with maximum correction.

1 cl, 2 ex