Table 2 Power vectors for the central, paracentral and peripheral corneal zones

Mean power (D ± SD) Pre-rubbing

−0.16 ± 0.26 (−1.09; 0.27)

−0.03 ± 0.25 (−1.12; 0.44)

−0.18 ± 0.25 (−0.99; 0.24)

0.02 ± 0.21 (−0.40; 0.58)

−0.31 ± 0.28 (−1.16; 0.20)

−0.01 ± 0.23 (−0.56; 0.68)

−0.29 ± 0.23 (−0.92; 0.10)

0.04 ± 0.19 (−0.28; 0.77)

−0.34 ± 0.34 (−1.29; 0.42)

−0.02 ± 0.21 (−0.69; 0.64)

−0.27 ± 0.35 (−1.22; 0.67)

0.02 ± 0.17 (−0.27; 0.62)

Mean power (D ± SD) Post-rubbing

−0.27 ± 0.33 (−1.62; 0.16)

−0.05 ± 0.29 (−0.93; 0.41)

−0.23 ± 0.26 (−1.00; 0.29)

0.01 ± 0.23 (−0.47; 0.45)

−0.32 ± 0.38 (−1.22; 0.97)

−0.02 ± 0.23 (−0.57; 0.51)

−0.24 ± 0.31 (−0.88; 0.65)

0.00 ± 0.18 (−0.41; 0.47)

−0.37 ± 0.37 (−1.22; 0.47)

−0.02 ± 0.19 (−0.52; 0.30)

−0.27 ± 0.37 (−0.94; 0.75)

0.02 ± 0.18 (−0.41; 0.55)

Mean power Difference (D)

−0.11

−0.02

−0.05

−0.01

−0.01

−0.01

0.05

−0.04

−0.03

0.00

0.00

0.00

P-value*

0.038

0.490

0.333

0.916

0.794

0.854

0.266

0.081

0.494

0.905

0.992

0.746