Table 2

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 Hg18.3 (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 acuity0.25 (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/mm22630.7 (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.