Table 3.

Mean Readings of Device 1 and Device 2, Difference and Mean Difference Between Device 1 and Device 2 and Limits of Agreement

	Mean Device 1	Mean Device 2	Mean Difference	Limit of Agreement
K1	42.8	43.02	−0.11	0.23 to −0.45
K2	43.99	44.21	−0.03	0.37 to −0.42
K1-back	−6.08	−5.98	−0.11	−0.01 to 0.20
K2-back	−6.41	−6.36	−0.05	0.07 to −0.18
K-max	44.62	45.49	−0.8	2.1 to −3.7
CCT	538.4	536	3.6	15.5 to −8.2
TLT	534.34	533	2.6	12.8 to −7.7
Q-front	−0.37	−0.22	−0.16	0.03 to −0.35
Q-back	−0.35	−0.78	−0.26	0.02 to −0.55
ACD	3.13	3.19	−0.05	0.04 to −0.14
ACA	39.65	42.44	−4.4	4.3 to −13.1
CD	11.72	12.2	−0.54	0.39 to −1.46
RMS-T	1.46	1.33	0.14	1.16 to −0.87
RMS-LOA	1.41	1.19	0.22	1.32 to −0.87
RMS-HOA	0.37	0.48	−0.11	0.11 to −0.33
SA	0.13	0.19	−0.05	0.19 to −0.29
Coma-0	0.03	−0.24	0.26	0.54 to −0.03
Coma-90	−0.12	0.003	−0.13	0.35 to −0.61
Trefoil-0	−0.04	0.014	−0.05	0.39 to −0.50
Trefoil-30	−0.08	−0.1	0.02	0.22 to −0.19

Abbreviations: SW, within-subject standard deviation; TRT, test–retest repeatability; CoV, coefficient of variation; K1, flat keratometry; K2, steep Keratometry; K Max, maximum keratometry; CCT, central corneal thickness; TLT, thinnest location thickness; Q-front, Q value on front surface at 6mm; Q-back, Q value on back surface at 6mm; ACD, anterior chamber depth; ACA, anterior chamber angle; CD, corneal diameter; RMS-T, total corneal aberration root mean square; RMS-LOA, root mean square of corneal low order aberrations; RMS-HOA, root mean square of corneal high order aberrations; SA, spherical aberrations; Coma-0, horizontal coma aberrations; Coma-90, vertical coma aberrations; Trefoil-0, oblique trefoil aberrations; Trefoil-30, vertical trefoil aberrations.