The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

Table 4 Intraobserver repeatability outcomes for corneal power obtained using Pentacam Scheimpflug imaging in children

Parameter	Observer	Mean ± SD	S_w	TRT	CoV (%)	ICC (95% CI)
Km	1st	43.13 ± 1.44	0.09	0.26	0.21	0.996 (0.994 to 0.997)
Km	2nd	43.14 ± 1.44	0.09	0.26	0.22	0.996 (0.994 to 0.997)
J₀	1st	−0.71 ± 0.45	0.09	0.25	–	0.962 (0.945 to 0.974)
J₀	2nd	−0.70 ± 0.45	0.09	0.25	–	0.961 (0.944 to 0.974)
J₄₅	1st	−0.03 ± 0.21	0.11	0.30	–	0.766 (0.682 to 0.835)
J₄₅	2nd	−0.04 ± 0.22	0.10	0.27	–	0.832 (0.767 to 0.883)
Nasal 2 mm	1st	42.23 ± 1.40	0.16	0.43	0.37	0.988 (0.982 to 0.992)
Nasal 2 mm	2nd	42.25 ± 1.40	0.16	0.43	0.37	0.988 (0.982 to 0.992)
Superior 2 mm	1st	43.84 ± 1.63	0.25	0.69	0.57	0.977 (0.967 to 0.984)
Superior 2 mm	2nd	43.86 ± 1.66	0.23	0.63	0.52	0.982 (0.973 to 0.988)
Temporal 2 mm	1st	42.73 ± 1.37	0.19	0.52	0.44	0.981 (0.973 to 0.987)
Temporal 2 mm	2nd	42.74 ± 1.37	0.18	0.50	0.42	0.983 (0.975 to 0.988)
Inferior 2 mm	1st	43.79 ± 1.71	0.25	0.69	0.57	0.979 (0.970 to 0.986)
Inferior 2 mm	2nd	43.77 ± 1.68	0.22	0.60	0.50	0.983 (0.976 to 0.989)
Nasal 5 mm	1st	41.94 ± 1.40	0.12	0.32	0.28	0.993 (0.990 to 0.995)
Nasal 5 mm	2nd	41.96 ± 1.41	0.11	0.31	0.27	0.994 (0.991 to 0.996)
Superior 5 mm	1st	43.50 ± 1.58	0.35	0.98	0.81	0.952 (0.931 to 0.967)
Superior 5 mm	2nd	43.51 ± 1.61	0.23	0.63	0.53	0.980 (0.971 to 0.987)
Temporal 5 mm	1st	42.48 ± 1.33	0.11	0.29	0.25	0.994 (0.991 to 0.996)
Temporal 5 mm	2nd	42.48 ± 1.34	0.10	0.29	0.24	0.994 (0.991 to 0.996)
Inferior 5 mm	1st	43.62 ± 1.56	0.17	0.46	0.38	0.989 (0.983 to 0.992)
Inferior 5 mm	2nd	43.60 ± 1.54	0.14	0.38	0.32	0.992 (0.988 to 0.995)

Keratometric data are in units of diopter (D); SD = standard deviation, S_w = within-subject standard deviation, TRT = test-retest repeatability (2.77 S_w), CoV = within-subject coefficient of variation, ICC = intraclass correlation coefficient

ISSN: 2326-0254