Table 1

Patient demographics and characteristics of study population

Gas groupStandard groups
Group A phakicGroup B pseudophakic/aphakic
No of patients512115
 Male29136
 Female2215
Race
 Caucasian492715
 Black21
Glaucoma type
 Primary open angle1853
 Pseudoexfoliation321
 Uveitic1275
 Post-vitrectomy7
 Aniridia4
 Angle closure422
 Anterior segment dysgenesis251
 Rubeotic21
 ICE syndrome11
 Post penetrating keratoplasty2
 Sturge Weber1
 Traumatic12
Previous surgery
 Cataract surgery50015
 Vitrectomy1211
 Trabeculectomy39217
 Ahmed valve61
 Deep sclerectomy2
 Cyclodiode1
Lens status
 Phakic128
 Aphakic64
 Pseudophakic4411
Ahmed valve model
 Model FP-7730
 Model S-2442515
Tube cover
 No cover021
 Tutoplast62
 Tutopatch62
 Donor sclera211511
 Scleral rotation flap1873
Mean age, years66.5±17.9 (range 22–90)50.6±17.3 (range 19–78)65.7±14.6 (range 36–80)
Corneal thickness603.8±79.6 (527–1000)576.6±65.0 (515–800)630.0±79.2 (523–745)
No of previous operations2.4±0.9 (range 1–5)0.9±0.8 (range 0–2)2.1±0.8 (range 1–3)
Presenting IOP (mm Hg)43.1±8.2 (range 24–62)40.1±10.7 (range 24–64)42.5±7.2 (range 32–60)
  • ICE, iridocorneal endothelial; IOP, intraocular pressure.