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First Author: S.Nikulin RUSSIA
Co Author(s): L. Balashevich A. Kachanov T. Churakov O. Efimov A. Zavjalov
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To compare the results of central corneal thickness measurements using confocal microscopy, optical coherent tomography, Scheimpflug keratotopography, ultrasound pachymetry and autorefractometry with pachymetry option in the long follow-up period after LASIK
S. Fyodorov IR&TC Eye Microsurgery, St.-Petersburg, Russia
The investigated group included 43 patients (86 eyes). The postoperative period after LASIK was 10 years. All patients before operation had low myopia. Except standard methods of examination we used Confoscan 4 (Nidec Tech., Japan), Visante OCT (Carl Zeiss, Germany), Pentacam (Oculus, USA), Ocuscan (Alcon, USA) and Park 1 (Oculus, USA). We researched only the central part of a cornea because of the different possibilities of the instruments.
Central corneal thickness after LASIK according to confocal microscope Confoscan 4 was 502,5 ±32,2ṁ; Scheimpflug keratotopographer "Pentacam" 519,1 ±31,6ṁ; ultrasound pachymeter Ocuscan 510,6 ±35,6ṁ, optical coherent tomographer "Visante OCT" 501,2 ±28,5ṁ; autorefractometer "Park 1" 517,6 ±33,4ṁ. For the data comparison we used nonparametric rank method and factor Kruskal-Wallis.
We found no statistically significant differences between the data obtained with the "Visante OCT" and Confoscan 4, and between "Pentacam" and Park 1. The values ??obtained using "Visante OCT" and Confoscan 4 were significant minimal, ultrasound pachymetry - in the range of the mean values, and "Pentacam" and Park 1 gave the largest values (H>6.0; P<.05).