Table 2. Estimation of Contact Lens Power.

Formula*	Power	Correlation	P Value
Regression	30.0±4.4	0.90	<0.001
Hug	29.8±5.8	0.75	<0.001
Aphakic glasses	23.7± 4.4	0.42	0.002
McClatchey	30.9±5.9	0.76	<0.001
Holladay 1	29.5±5.0	0.71	<0.001
Hoffer Q	30.1±5.9	0.86	<0.001
SRK/T	29.0±4.6	0.79	<0.001

SRK/T = Sanders-Retzlaff-Kraff/T.

^*Note that refraction at corneal plane was 29.6±4.4 diopters.