Table 1 Demographic and refractive data of all groups

N

104

211

175

83

Sex (M/F)

44/60

79/132

77/98

24/59

Refractive errors (Mean ± SD)

 Sphere

-0.04 ± 0.25

-1.72 ± 1.38

-1.10 ± 2.87

1.52 ± 1.37

 Cylinder

-0.49 ± 0.20

-0.50 ± 0.18

-1.56 ± 1.42

-0.40 ± 0.39

 Spherical equivalent

-0.25 ± 0.22

-1.91 ± 1.40

-1.78 ± 2.98

1.38 ± 1.46