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

From: A randomized, fellow eye, comparison of keratometry, aberrometry, tear film, axial length and the anterior chamber depth after eye rubbing in non-keratoconic eyes

  CENTRAL (1–3 mm) PARACENTRAL (4–5 mm) PERIPHERAL (6–7 mm)
CASES CONTROLS CASES CONTROLS CASES CONTROLS
J0 J45 J0 J45 J0 J45 J0 J45 J0 J45 J0 J45
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
  1. Abbreviations: D = Diopters; SD = standard deviation
  2. *paired t test