Table 4. Comparison of the Flat Keratometry between 8 Different Devices.

Devices	Mean Difference(D) ± SD	P Value	95% LoA (D)
Tomey-Topcon	−0.05±0.09	<.01	−0.226 to 0.134
Tomey-IOLMaster	−0.12±0.08	<.01	−0.278 to 0.044
Tomey-EyeSys	0.20±0.11	<.01	−0.010 to 0.41
Tomey-Medmont	−0.20±0.15	<.01	−0.480 to 0.090
Tomey-Topolyzer	−0.05±0.09	<.01	−0.231 to 0.133
Tomey-Pentacam	−0.05±0.09	<.01	−0.236 to 0.132
Tomey-Sirius	−0.12±0.11	<.01	−0.330 to 0.09
Topcon-IOLMaster	−0.07±0.09	<.01	−0.246 to 0.103
Topcon-EyeSys	0.24±0.14	<.01	−0.02 to 0.51
Topcon-Medmont	−0.15±0.14	<.01	−0.42 to 0.12
Topcon-Topolyzer	0.00±0.10	.851	−0.196 to 0.19
Topcon-Pentacam	−0.01±0.11	.735	−0.22 to0.21
Topcon-Sirius	−0.08±0.12	<.01	−0.31 to0.15
IOLMaster-EyeSys	0.32±0.12	<.01	0.07 to 0.56
IOLMaster-Medmont	−0.08±0.15	<.01	−0.37 to 0.21
IOLMaster-Topolyzer	0.07±0.08	<.01	−0.082 to 0.219
IOLMaster-Pentacam	0.07±0.11	<.01	−0.16 to 0.29
IOLMaster-Sirius	0.00±0.11	.859	−0.22 to 0.22
EyeSys-Medmont	−0.40±0.17	<.01	−0.73 to −0.06
EyeSys-Topolyzer	−0.25±0.13	<.01	−0.5 to 0
EyeSys-Pentacam	−0.25±0.11	<.01	−0.47 to 0.03
EyeSys-Sirius	−0.32±0.12	<.01	−0.56 to −0.08
Medmont-Topolyzer	0.15±0.15	<.01	−0.14 to 0.44
Medmont-Pentacam	0.14±0.14	<.01	−0.14 to 0.43
Medmont-Sirius	0.08±0.17	.014	−0.26 to 0.42
Topolyzer-Pentacam	0.00±0.11	.872	−0.23 to 0.22
Topolyzer-Sirius	−0.07±0.12	<.01	−0.31 to0.17
Pentacam-Sirius	−0.07±0.10	<.01	−0.263 to 0.126

D = diopter, SD = standard deviation, LoA = limits of agreement.