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Comparison of central corneal thickness measurements using confocal microscope and other devices in the long follow-up period after LASIK

Poster Details

First Author: S.Nikulin RUSSIA

Co Author(s):    L. Balashevich   A. Kachanov   T. Churakov   O. Efimov   A. Zavjalov  

Abstract Details


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).

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