METHOD FOR PREPARING ULTRATHIN DONOR CORNEAL TRANSPLANTS FOR POSTERIOR LAYERED KEROPLASTY BY SEQUENTIAL APPLICATION OF AUTOMATIC MICROKERATOME AND TWO-STAGE PHOTOABLATION ON EXCIMER LASER Russian patent published in 2017 - IPC A61F9/07 A61F9/08 

FIELD: medicine.

SUBSTANCE: invention is designed to form an ultrathin corneal transplant of even width for posterior layered keratoplasty using a microkeratome and an excimer laser. At the first stage, section is performed by the microkeratome under the control of ultrasonic or OCT pachymetry, then repeated ultrasonic pachymetry or pachymetry on the optical coherent tomograph is performed, followed by the two-stage ablation with a flat beam, using an excimer laser ophthalmologic unit, the first ablation stage is performed in an annular zone with an internal diametre of 4-6 mm, the outside diametre of 9.0 mm to a depth of 50-80 mcm, the second photoablation stage with a diametre 9.0 mm is performed with the calculation of obtaining a residual thickness of the cornea in the central zone of 120-140 mcm.

EFFECT: method allows to obtain an ultrathin transplant of uniform thickness without the risk of perforation of the donor cornea and its rejection.

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