| Interventions | No | Percentage | Rate† |
| Adjustment or release of sutures | 21 | 53.8 | |
| Subconjunctival injections* | |||
| None | 12 | 30.8 | 8.8 |
| 1 | 13 | 33.3 | 9.5 |
| 2–3 | 7 | 17.9 | 5.1 |
| 4–9 | 4 | 10.3 | 2.9 |
| ⩾10 | 3 | 7.7 | 2.2 |
| Needling revision of bleb | |||
| None | 22 | 56.4 | 16.1 |
| 1 | 7 | 17.9 | 5.1 |
| 2 | 4 | 10.3 | 2.9 |
| ⩾3 | 6 | 15.4 | 4.4 |
| Cataract surgery (34 phakic eyes preoperatively) | 6 | 17.6 | 4.8 |
| Surgical failures | No | Percentage | Rate |
| Tube implantation | 3 | 7.7 | 2.2 |
| Topical anti-glaucoma medication required | 1 | 2.6 | 0.7 |
| IOP >21 mm Hg in ⩾10% of follow-up months‡ | 5 | 12.8 | 3.6 |
| IOP >15 mm Hg in ⩾10% of follow-up months‡ | 10 | 25.6 | 8.0 |
| Complications | No | Percentage | |
| Eyes with IOP ⩽5 after first 2 weeks | |||
| Once | 4 | 10.3 | |
| Twice | 1 | 2.6 | |
| Four times | 1 | 2.6 | |
| Seidel+after first 2 weeks | 1 | 2.6 | |
| Choroidal detachment anytime | 1 | 2.6 | |
| Macroscopic hyphaema | 2 | 5.1 | |
| Blebitis or endophthalmitis | 0 | 0.0 |
*Any subconjunctival drug delivery, including during needling procedures.
†Rate as a percentage per person-year of follow-up.
‡Includes the three patients who required tube implantation.
IOP, intraocular pressure.