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[Comparative measurements of central corneal thickness with two ultrasound pachymeters]
E Schmidt1, K Schwanitz, A G Böhm
1Augenklinik, Universität, Fetscherstrasse 74, 01307 , Dresden. Eckart.Schmidt@uniklinikum-dresden.de
Background:
The aim of this study was to compare two different ultrasound pachymeters based on measurements of central corneal thickness (CCT).
Methods:
CCT of 1,070 eyes of 535 patients (glaucoma and glaucoma suspects) was determined using the ultrasound pachymeter IOPac (Heidelberg Engineering, Germany) and SP-3000 (Tomey Corporation, Japan). With the IOPac 8 measurements are averaged by the instrument and with the SP-3000 200 measurements, respectively. For statistical purposes intraclass correlation coefficients (ICC) and Bland-Altman analysis were calculated.
Results:
The mean CCT was 561.3+/-35.6 microm (IOPac) and 561.8+/-35.6 microm (SP-3000). The mean difference between both pachymeters was 0+/-8 microm. ICC was 0.9746 (95% confidence interval: 0.9714-0.9774).
Conclusions:
The use of the two instruments tested has no influence on the determination of CCT. The measured CCT of glaucoma patients or suspects were slightly above the CCT of normals of other studies.
