METHOD FOR CALCULATING THE REFRACTIVE EFFECT WHEN IMPLANTING INTRASTROMAL SEGMENTS INTO A CORNEAL GRAFT Russian patent published in 2024 - IPC A61F9/07 A61F2/14 A61B3/103 

FIELD: medicine; ophthalmology.

SUBSTANCE: invention can be used to calculate the refractive effect when implanting intrastromal corneal segments into a corneal graft. When two intrastromal corneal segments (ICS) of equal height, from 150 to 400 mcm with a step of 50 mcm, arc length from 90° up to 160°, internal radius of curvature 2.5 mm, external radius of curvature 3.1 mm are implanted into a corneal graft, the refractive effect is calculated. Calculation of the refractive effect includes determination of the correctable spherical component of refraction and corneal astigmatism, calculated using formulas depending on the arc length of the implanted intrastromal corneal segments. When implanting two identical segments with an arc length of 90°, each correctable spherical component of hypermetropic refraction is calculated using the following formula: 0.015×h - 0.005×C, correctable corneal astigmatism according to the formula: 0.031×h - 0.007×C. When implanting two identical segments with an arc length of 120°, each correctable spherical component of myopic refraction is calculated using the following formula: 0.015×h - 0.005×C, correctable corneal astigmatism according to the formula: 0.018×h - 0.005×C. When implanting two identical segments with an arc length of 160° each correctable spherical component of myopic refraction is calculated using the formula: 0.03×h - 0.009×C, correctable corneal astigmatism is calculated using the following formula: 0.003×h - 0.001×C, taking into account the height of the implanted intrastromal corneal segments h and the depth of their implantation in the corneal graft C.

EFFECT: invention ensures predictability of the refractive result after implantation of the ICS and the achievement of maximum visual acuity.

1 cl, 12 tbl, 3 ex