Abstract
Purpose . To perform a comparative 3D digital morphometric assessment of corneal flap formed using a femtosecond laser Femto Visum and Femto LDV Z6. Material and methods . Experiment was performed on 20 cadaver eyes, on which corneal flaps were formed using the femtosecond laser systems Femto Visum (Optosystems, Russia) (Group 1 – «Femto Visum» – 10 eyes) and Femto LDV Z6 (Ziemer, Switzerland) (Group 2 – «Femto LDV Z6» – 10 eyes). In both groups, the corneal flap was formed on the set parameters: side cut angle – 70°, the flap thickness – 100 µm, diameter of stromal bed – 9.0 mm. By using 3D digital microscope Hirox KH-8700 (Japan) the side cut angle of the flap, the flap thickness and diameter of the stromal bed were measured. Results . With 3D digital estimation we obtained following results in group 1 («Femto Visum»): side cut angle – 74.61±3.09°, the flap thickness – 87.91±6.93 µm, diameter of the stromal bed – 8.88±0.09 mm; in group 2 ( «Femto LDV Z6») – side cut angle – 74.06±3.08°, the flap thickness – 87.92±7.79 µm, diameter of the stromal bed – 8.83±0.06 mm. Those parameters are not statistically different between the two groups (p>0.05, Mann-Whitney U-test). Conclusions . 1. 3D digital microscope Hirox KH-8700 allows precise measurements of morphometric parameters of corneal flap in the coordinates X, Y, Z. 2. Femtosecond laser systems, Femto Visum and Femto LDV Z6, allow us to create the corneal flap such that the side cut angle and the diameter of the corneal stromal bed meet the set parameters, with no statistically significant difference between systems (p>0.05). The flap thickness was thinner than desired, («Femto Visum» and «Femto LDV Z6»), but there was no statistical difference between two groups (p>0.05).
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