Surgical outcome
| Abexterno TLO (n=50) | Abinterno TLO (n=50) | P value | |
| Success rate (%) | 39(78) | 37(74) | 1.00* |
| Postoperative mean IOP (SD), mm Hg | 18.3 (7.4) | 17.8 (6.3) | 0.91† |
| Change in IOP (SD), (%) | 40.5 (22.5) | 34.4 (25.4) | 0.15† |
| Postoperative glaucoma drug score (SD) | 2.6 (1.9) | 3.1 (1.6) | 0.06† |
| Change in glaucoma drug score (SD) | 1.7 (2.1) | 1.5 (2.3) | 0.71† |
| Postoperative logMAR visual acuity | 0.25 (0.35) | 0.05 (0.23) | 0.04† |
| Change in logMAR visual acuity (SD) | −0.03 (0.30) | 0.01 (0.14) | 0.43† |
| Postoperative corneal endothelial cell density (SD), cells/mm2 | 2630.7 (320.9) | 2369.9 (633.2) | 0.08† |
| Change in corneal endothelial cell density (SD), % | +1.4 (9.2) | −1.2 (10.5) | <0.0001† |
*Fisher’s exact test.
†Mann-Whitney U test.
ab externo TLO, trabeculotomy ab externo; ab interno TLO, trabeculotomy ab interno using a microhook; IOP, intraocular pressure; logMAR, logarithm of minimal angle resolution.