Table 2.

Root mean square values for the higher order (third through sixth order) aberrations in each study group.

	RMS of 3rd order	RMS of 4th order	RMS of 5th order	RMS of 6th order
Round	0.162 ± 0.076	0.269 ± 0.066	0.068 ± 0.025	0.032 ± 0.012
Oval	0.149 ± 0.072	0.216 ± 0.058	0.0596 ± 0.025	0.044 ± 0.017
Symmetrical bow tie	0.183 ± 0.091	0.228 ± 0.067	0.063 ± 0.027	0.036 ± 0.013
Asymmetrical bow tie	0.378 ± 0.086	0.242 ± 0.064	0.062 ± 0.022	0.039 ± 0.014
Irregular	0.254 ± 0.137	0.335 ± 0.070	0.110 ± 0.074	0.062 ± 0.035
Total eyes	0.225 ± 0.127	0.258 ± 0.077	0.072 ± 0.044	0.043 ± 0.022

Root mean square (RMS).