G I

G II

G III

G IV

p-value

Sex M/F

20/10

18/12

17/13

17/13

0.841

Age

48.60 ± 5.96

48.40 ± 6.30

48.83 ± 5.83

50.43 ± 6.36

0.559

IOP before block

21.28 ± 2.10

21.49 ± 1.89

21.25 ± 1.81

21.09 ± 2.0

0.888

IOP after block

21.14 ± 2.14

18.65 ± 1.57

20.06± 1.53

21.22 ± 1.66

0.001*

Onset of anesthesia

3.77 ± 0.90

2.57 ± 0.50

1.77± 0.63

3.60 ± 0.89

0.001*