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Comparison between central corneal thickness measurements with a standard ultrasound and optical pachymetry

Poster Details

First Author: A.Vazquez Hernandez SPAIN

Co Author(s):    A. Mancebo   R. Gomez   M. Marcos              

Abstract Details


To compare the precision of central corneal thickness (CCT) measurements taken with the handheld ultrasound pachymeter (USP) and the optical (OP) to verify its reliability, precision and predictability.


Ultrasound pachymetry measurements were performed after the eyes were anesthetised with one drop of 0.4% oxybuprocaine hydrochloride. Three measurements were obtained (initial, stromal-pre-lasik-ablation and post-lasik-ablation) but we only included the stromal-pre-lasik-ablation due to the other two were affected by surgery factors.


In this prospective study, 79 eyes of 43 healthy patients undergoing LASIK surgery in Clinica Baviera Valladolid were included in the study. CCT measurements were obtained using Ultrasonic pachymeter DGH-5100 Topcon and optic pachymeter WaveLight EX-500. The results were evaluated using the computer program Statgraphics and the T- test.


The average CCT (± standard deviation) was 478,7 ± 25.6 μm and 474.2 ± 23.7 μm for USP and OP respectively. The P value for the means difference is P =0.25 with an IC 95% (Confidence interval), the T-test revealed no statistically difference between USP and OP (P > 0.05).


No difference was found in the measurements for the total central pachymetry. The two systems are reliable and precise tools for the measurement of stromal thickness, and helpful for refractive surgery.

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