Table 8. Causes of failure.
| Causes | No. of eyes (%) |
| Chronic hypotony | 2 (1.6) |
| Endophthalmitis | 2 (1.6) |
| Extruded AGV | 2 (1.6) |
| Recessed tube | 8 (6.45) |
| Tube infection | 1 (0.8) |
| Failure of deroofing of encapsulated plate | 13 (10.5) |
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