Table 1. Intrasession Repeatability of 8 Different Devices in Measuring Flat Keratometry (N = 35).

Device	Session	Mean (D) ± SD	Sw (D)	2.77 Sw (D)	COV (%)	ICC
Tomey RC	1st	42.85±1.26	0.04	0.10	0.08	0.999
	2nd	42.85±1.27	0.03	0.09	0.08	0.999
Topcon KR	1st	42.90±1.30	0.05	0.15	0.13	0.998
	2nd	42.91±1.27	0.06	0.17	0.14	0.998
IOLMaster	1st	42.97±1.27	0.03	0.09	0.07	0.999
	2nd	42.99±1.27	0.04	0.10	0.08	0.999
EyeSys Vista	1st	42.65±1.21	0.13	0.36	0.30	0.989
	2nd	42.64±1.19	0.10	0.29	0.24	0.992
Medmont	1st	43.05±1.29	0.07	0.20	0.17	0.997
	2nd	43.06±1.27	0.07	0.20	0.17	0.997
Topolyzer	1st	42.90±1.28	0.10	0.27	0.23	0.994
	2nd	42.91±1.25	0.10	0.27	0.23	0.994
Pentacam	1st	42.90±1.26	0.08	0.21	0.18	0.996
	2nd	42.90±1.26	0.07	0.20	0.17	0.997
Sirius	1st	42.97±1.26	0.10	0.27	0.23	0.994
	2nd	43.01±1.28	0.08	0.22	0.18	0.996

D = diopter, SD = standard deviation, Sw = within-subject standard deviation, COV = within-subject coefficient of variation, ICC = intraclass correlation coefficient.