Adverse events
| Abexterno TLO (n=50) | Abinterno TLO (n=50) | P value* | |
| Hyphema with niveau (%) | 10(20) | 8 (16) | 0.80 |
| Transient increase in IOP (%) | 12(24) | 18(36) | 0.28 |
| Additional glaucoma surgeries (%) | 9 (18) | 11(22) | 0.80 |
| Trabeculectomy | 8 (16) | 9 (18) | 1.00 |
| Tube shunt surgery | 1 (2) | 2 (4) | 1.00 |
| Vitreous haemorrhage (%) | 1 (2) | 2 (4) | 1.00 |
| Descemet membrane rupture (%) | 3 (6) | 0 (0) | 0.24 |
| Transient hypotony (%) | 1 (2) | 0 (0) | 1.00 |
| Cystoid macular oedema (%) | 0 (0) | 1 (2) | 1.00 |
| Bullous keratopathy (%) | 0 (0) | 1 (2) | 1.00 |
*Fisher’s exact test.
ab externo TLO, trabeculotomy ab externo; ab interno, trabeculotomy ab interno using a microhook; IOP, intraocular pressure.