Table 2 Postoperative data from groups 1 and 2 during the first year from Ahmed glaucoma valve implantation

Post-AGVI BCVA

1.22 ± 0.79

1.21 ± 0.69

1.25 ± 0.86

0.961†

Unfavorable visual outcome (%)

12 (34.3)

7 (43.8)

5 (26.3)

0.311‡

IOP at the time of AGVI (mmHg)

36.8 ± 9.36

41.3 ± 7.4

33.1 ± 9.2

0.003†

Postoperative IOP

3 months after AGVI

17.9 ± 7.1

17.8 ± 9.7

18.0 ± 3.6*

0.108†

6 months after AGVI

17.6 ± 6.1**

16.3 ± 3.7*

18.7 ± 7.3*

0.513†

12 months after AGVI

15.2 ± 4.0**

14.5 ± 3.7*

15.7 ± 4.2*

0.327†

Surgical success at one year based on IOP (%)

30 (85.7)

13 (81.3)

17 (89.5)

0.642‡

Complications (%)

Anterior chamber hyphema

6 (17.1)

3 (18.8)

3 (15.8)

1.000‡

Tube obstruction

1 (2.9)

1 (6.3)

0 (0)

0.457‡

Vitreous hemorrhage

8 (22.9)

4 (25.0)

4 (21.1)

1.000‡

Early hypotony with choroidal detachment

or collapsed anterior chamber

1 (2.9)

1 (6.3)

0 (0)

0.441‡

Endophthalmitis

0 (0)

0 (0)

0 (0)

1.000‡