Table 1.

Average and differences in central corneal thickness betweeen the three different devices

CCT	Mean±SD	Difference (µm)	P
USP versus OCT	527.4±39.5 versus 498.3±34.9	29.1	<0.001
USP versus TMS-5 topographer	527.4±39.5 versus 505.6±33.2	21.8	<0.001
TMS-5 topgrapher versus OCT	505.6±33.2 versus 498.3±34.9	7.3	<0.001

CCT: Central corneal thickness, SD: Standard deviation, USP: Ultrasonic pachymeter, OCT: Optical coherence tomographer