Precision of Corneal Thickness Measurements Obtained Using the Scheimpflug-Placido Imaging and Agreement with Ultrasound Pachymetry

Table 1

Intraoperator repeatability of central corneal thickness (CCT) and the thinnest corneal thickness (TCT) readings using the Scheimpflug-Placido topographic modeling system (TMS-5).

Parameters	Mean ± SD (μm)	Sw (μm)	2.77 Sw (μm)	CoV (%)	ICC (95% CI)
1st observer
CCT	525.22 ± 30.41	6.51	18.05	1.24	0.955 (0.936 to 0.970)
TCT	520.87 ± 30.49	6.60	18.27	1.27	0.955 (0.934 to 0.970)
2nd observer
CCT	525.67 ± 29.62	6.32	17.50	1.20	0.956 (0.935 to 0.971)
TCT	521.43 ± 29.64	6.39	17.70	1.23	0.955 (0.934 to 0.970)

SD: standard deviation; Sw: within-subject standard deviation; CoV: coefficient of variation; ICC: intraclass correlation coefficient; CI: confidence interval.