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First Author: U.De Sanctis ITALY
Co Author(s): M. Catalano E. Bartoli L. Vinai
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To compare the thickness of LASIK flaps prepared using 2 different femtosecond lasers.
Private practice LAS.E.R., Torino, Italy.
This prospective study included one eye of 80 candidates for LASIK. Surgery was performed by a single surgeon, planning the flap thickness at 100 ṁm. The femtosecond laser used to cut the flap was the Intralase 150kHz (Abbott Medical Optics, Inc) in 40 eyes, and the Visumax 500kHz (Carl Zeiss Meditec AG) in 40 eyes. One month after surgery, the flap thickness was measured at the corneal vertex and 3 mm from the vertex on the temporal (T3) and nasal sides (N3) using a spectral-domain OCT (RTVue100, OptoVue Inc). The Student T test was used to compare the differences between achieved versus predicted flap thickness values with the 2 instruments.
The mean flap thickness was slightly higher than predicted using either femtosecond laser. Differences between achieved versus predicted thickness at the vertex, T3 and N3 were, respectively, +8.30ḟ12.98, +14.05ḟ13.57 and +16.50ḟ11.20 ṁm using the Intralase 150kHz, and +8.00ḟ11.57, +14.60ḟ9.03 and +12.60ḟ9.88 ṁm using the Visumax kHz500. The difference between achieved versus predicted thickness did not differ significantly between the 2 instruments (p<0.05).
LASIK flaps prepared using either femtosecond laser had predictable thickness; flap thickness was on average slightly higher than predicted using either instrument. Although this difference was slight, it should be considered in calculating the residual stromal bed thickness accurately.