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. 2004 Feb;88(2):174-7.
doi: 10.1136/bjo.2003.023416.

Intraobserver and interobserver reproducibility in the evaluation of ultrasonic pachymetry measurements of central corneal thickness

S Miglior  1 , E Albe, M Guareschi, G Mandelli, S Gomarasca, N Orzalesi
Affiliations

Intraobserver and interobserver reproducibility in the evaluation of ultrasonic pachymetry measurements of central corneal thickness

S Miglior et al. Br J Ophthalmol. 2004 Feb.

Abstract

Purpose: To assess reproducibility of central corneal thickness (CCT) measurement by means of ultrasonic pachymetry.

Methods: Fifty one volunteers underwent three sessions of CCT measurements, each consisting of three CCT measurements, performed by each of three different observers. Intra- and interobserver reproducibility was calculated by means of intraclass correlation coefficient (ICC). The expected range of variability between two independent evaluations was calculated using scatter plots of each test-retest difference against their mean. The standard deviation of the mean differences in the test-retest scores was used to describe the differences in the score spread.

Results: The ICC ranges of the intra- and interobserver evaluations were 0.95-0.97 and 0.89-0.95 respectively; the expected variability was < or = +/-1% and < or = +/- 2% respectively (95% confidence interval).

Conclusions: The measurement of CCT by means of ultrasonic pachymetry is highly reproducible.

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