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. Author manuscript; available in PMC: 2015 Jun 13.
Published in final edited form as: J Refract Surg. 2009 Nov 16;26(9):646–659. doi: 10.3928/1081597X-20091105-01

Table 3. Repeatability of Central Epithelial Thickness Measurements.

Author (Year) Instrument Method n m σw2 (μm) COR (μm) CV (%)
Reinstein (2009) Artemis 1 VHF digital ultrasound 10 5 0.58 1.14 0.97
Wirbelauer & Pham64 (2004) SL-OCT OCT 25 3 3.24 6.35 5.69
Sin & Simpson63 (2006) Humphrey Zeiss OCT OCT 18 3 3.33 6.53 6.41

Values printed in light gray are derived from other reported values.

n = number of eyes included in the study, m = number of repeated measurements, σw2 = standard deviation (SD) of m repeated measurements, COR = coefficient of repeatability (1.96 * SD), CV = coefficient of variation (ratio of SD over the mean of the measurements), OCT = optical coherence tomography Artemis 1 (ArcScan Inc, Morrison, Colorado); SL-OCT (Heidelberg Engineering GmbH, Heidelberg, Germany); Humphrey Zeiss OCT (Carl Zeiss Meditec, Jena, Germany)