Table 3.

Mean higher order aberrations in simple myopia, and compound myopic astigmatism subgroups.

	Total	Simple myopia	Compound myopic astigmatism	P-value
Horizontal coma (Z3 1) (µm)	0.03 ± 0.12	0.03 ± 0.12	0.02 ± 0.13	0.50
Vertical coma (Z3 -1) (µm)	0.09 ± 0.18	0.07± 0.17	0.10 ± .18	P < 0.001
Oblique trefoil (Z3 3) (µm)	0.02 ± 0.13	0.03 ± 0.12	0.01 ± 0.13	0.04
Vertical trefoil (Z3 -3) (µm)	-0.10 ± 0.16	-0.09 ± 0.16	-0.11 ± 0.15	0.02
Spherical aberration (Z4 0) (µm)	0.03 ± 0.14	0.03 ± 0.14	0.03 ± 0.15	0.10
Total root mean square wave-front error	0.35 ± 0.17	0.34 ± 0.16	0.37 ± 0.18	P < 0.001