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Table 3 Comparison of the corneal power and WTW distance measurements in male and female subjects

From: Comparison of the Orbscan II topographer and the iTrace aberrometer for the measurements of keratometry and corneal diameter in myopic patients

gender

parameters

Orbscan II

iTrace

P Valuea

95 % LoA

Male

Kf (D)

42.12 ± 1.39

41.63 ± 1.37

<0.0001

−0.28,1.26

(n = 51)

Ks (D)

43.34 ± 1.63

42.79 ± 1.65

<0.0001

−0.17,1.26

 

WTW (mm)

11.64 ± 0.32

11.40 ± 0.33

<0.0001

0.01,0.47

Female

Kf (D)

43.02 ± 1.14

42.51 ± 1.16

<0.0001

−0.13,1.16

(n = 49)

Ks (D)

44.20 ± 1.41

43.65 ± 1.36

<0.0001

−0.14,1.24

 

WTW (mm)

11.49 ± 0.34

11.25 ± 0.37

<0.0001

−0.01,0.48

  1. Data are expressed as mean ± SD; apaired t test <0.05 considered significant; Kf = flat axis power; Ks = steep axis power, D = diopter, LoA = limits of agreement