Table 2.

Vector analysis outcome using Alpins method

	Mean	Range a
TIA(D)	1.40 ± 0.37	1.25, 1.55
SIA(D)	1.22 ± 0.46	1.02, 1.41
DV(D)	0.70 ± 0.29	0.58, 0.82
ME(D)	−0.18 ± 0.36	−0.33, 0.04
AE(°)	0.85 ± 13.69	−4.80, 6.51
CI	0.88 ± 0.29	0.76, 0.99
FI	0.78 ± 0.25	0.67, 0.88
IOS	0.51 ± 0.19	0.43, 0.59

TIA target-induced astigmatism, SIA surgically induced astigmatism, DV difference vector, ME magnitude of error, AE angle of error, CI correction index, FI flattening index, IOS index of success

^a95% confidence interval