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M. Ramirez, Sr., E. Hernandez-Quintela, Sr., R. Naranjo-Tackman, Sr.; Lasik: Corneal Flap Thickness Planed vs. Measured With Confocal Microscopy by Using 3 Different Systems to Create the Flap. Invest. Ophthalmol. Vis. Sci. 2008;49(13):2910.
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To evaluate the difference between planed and measured corneal flap thickness after LASIK with three equipments to create the corneal flap.
90 eyes of 45 patients underwent LASK, corneal flaps were created by 3 different equipments: Group A: 30 eyes done by using the Hansatome microkeratome (Chiron Vision Corp, Claremont, Calif) to create a planed 160µm corneal flap, Group B: 30 eyes done by using the BD K-300 microkeratome (BD Ophthalmic Systems, Waltham, Mass) to create a planed 130 µm corneal flap, and group C: 30 eyes done by using the Femtosecond surgical laser (IntraLase Corp, Irvine, Calif) to create a planed 100 µm corneal flap. A Visx star 4 system (Visx, Santa Ana, CA, USA) was used to perform the laser ablation in all eyes. A central scan of the total corneal thickness was taken with the confocal microscope (Confoscan 4, Fortune Technologies, Italy) at 2 weeks after surgery. Corneal flap thickness was measured by using the NAVIS software V. 3.5.0 (NIDEK, Multi-Instrument Diagnostic System, Japan).
Measured mean flap thickness after LASIK at group A was thinner than planed (146.5 ± 20.3 µm P < 0.05). Measured mean flap thickness after LASIK at group B was not statistically significant different compared to planed (11.7 ± 12.9 µm P= 1.37). Measured mean flap thickness after LASIK at group C was thicker than planed (10.9 ± 13.8 µm P < 0.05)
We found in only one of the three evaluated systems to create the corneal flap a not statistically significant difference between planed vs measured thickness but all of them showed more than 10 µm SD of measured thickness.
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