Table 1

Preoperative patient demographics

Abexterno TLO (n=50)Abinterno TLO (n=50)P value
Mean age (SD)66.0 (16.9)66.6 (15.7)0.98*
Right eye (%)22(44)18(36)0.54†
Men (%)25(50)26(52)1.00†
Combined cataract surgery (%)10(20)12(24)0.81†
Preoperative HVF MD (SD), dB−11.0 (7.8)−13.6 (8.6)0.14*
Preoperative IOP (SD), mm Hg32.5 (11.2)28.4 (7.8)0.08*
Preoperative glaucoma drug score (SD)4.3 (1.4)4.9 (1.1)0.02*
Phakia(%)23(46)17(34)0.77*
Preoperative logMAR visual acuity0.19 (0.52)0.04 (0.22)<0.01*
Preoperative corneal endothelial cell density (SD), cells/mm22600.5 (346.9)2391.9 (592.2)0.09*
Glaucoma type
 Primary open angle glaucoma (%)15(30)22(44)0.21†
 Exfoliation glaucoma (%)17(34)17(34)
 Steroid-induced glaucoma (%)9 (18)4 (8)
 Other secondary glaucoma (%)9 (18)7 (14)
  • *Mann-Whitney U test.

  • †Fisher’s exact test.

  • ab externo TLO, trabeculotomy ab externo; ab interno TLO, trabeculotomy ab interno using a microhook; HVF, Humphrey visual field; IOP, intraocular pressure; logMAR, logarithm of minimal angle resolution; MD, mean deviation.