Eyes undergoing both treatments had improved best-corrected visual acuity ( WFG : mean , 0.05 [ 95 % CI , 0.03-0 .07 ] ; WFO : mean , 0.04 [ 95 % CI , 0.02-0 .06 ] ) and less sphere ( WFG : mean , -4.79 [ 95 % CI , -5.31 to -4.26 ] ; WFO : mean , -4.61 [ 95 % CI , -5.18 to -4.03 ] ) , cylinder ( WFG : mean , 0.66 [ 95 % CI , 0.49-0 .82 ] ; WFO : mean , 0.52 [ 95 % CI , 0.35-0 .69 ] ) , and spherical equivalents ( WFG : mean , -4.45 [ 95 % CI , -4.99 to -3.91 ] ; WFO : mean , -4.34 [ 95 % CI , -4.92 to -3.76 ] ) ( P < .001 ) but higher levels of spherical aberration ( WFG : mean , -0.11 [ 95 % CI , -0.15 to -0.06 ] ; WFO : mean , -0.11 [ 95 % CI , -0.14 to -0.07 ] ) ( P < .001 ) and higher-order root-mean-square aberrations ( WFO : mean , -0.07 [ 95 % CI , -0.12 to -0.02 ] ; WFO : mean , -0.12 [ 95 % CI , -0.17 to -0.70 ] ) ( P = .005 in WFG eyes and P < .001 in WFO eyes ) at 12 months compared with preoperative measurements .