Comparison of corneal tomography using a novel swept-source optical coherence tomographer and rotating Scheimpflug system in normal and keratoconus eyes: repeatability and agreement analysis

Table 4 Repeatability of corneal thickness of all used devices

Parameter	Device	Normal eyes				Mild KC				Moderate KC
Parameter	Device	Mean ± SD	Sw	Repeatability	CV (%)	Mean ± SD	Sw	Repeatability	CV (%)	Mean ± SD	Sw	Repeatability	CV (%)
CCT (µm)	RSC	556 ± 25	1.449	4.017	0.223	515 ± 31	2.366	6.559	0.307	466 ± 32	3.033	8.407	0.561
CCT (µm)	SS-OCT	549 ± 26	0.775	2.147	0.097	513 ± 30	0.775	2.147	0.134	462 ± 34	1.732	4.801	0.271
MCT (µm)	RSC	553 ± 25	1.761	4.880	0.272	501 ± 30	2.387	6.618	0.402	451 ± 31	3.033	8.407	0.566
MCT (µm)	SS-OCT	546 ± 27	0.775	2.147	0.095	493 ± 27	0.894	2.479	0.125	444 ± 30	1.225	3.395	0.196

CCT = central corneal thickness; CV = coefficient of variation; KC = keratoconus; MCT = minimal corneal thickness; repeatability = coefficient of repeatability; RSC = rotating Scheimpflug camera; SS-OCT = swept-source optical coherence tomography; Sw = within-subject standard deviation

ISSN: 2326-0254