The Asia Primary Tube Versus Trab (TVT) Study

Exclusion Criteria

• •1. Unwilling or unable to give consent, unwilling to accept randomisation, or unable to return for scheduled protocol visits.
• •2. Pregnant or nursing women
• •3. No light perception vision
• •4. Previous incisional intraocular surgery, other than uncomplicated clear corneal cataract surgery
• •5. Previous ocular laser in study eye (keratorefractive surgery and cyclodestructive procedure), except for laser trabeculoplasty procedures (Argon Laser and Selective Laser Trabeculoplasty)
• •6. Iris neovascularisation or proliferative retinopathy
• •7. Primary angle closure or primary angle closure glaucoma
• •8. Iridocorneal endothelial syndrome or anterior segment dysgenesis
• •9. Epithelial or fibrous downgrowth
• •10. Aphakia
• •11. Chronic or recurrent uveitis
• •12. Severe posterior blepharitis
• •13. Unwilling to discontinue contact lens use after surgery
• •14. Glaucoma secondary to penetrating keratoplasty, trauma, steroids, retinal disease/surgery or neovascular disease
• •15. Conjunctival scarring from prior ocular surgery, trauma or cicatrizing disease precluding a superior trabeculectomy
• •16. Need for glaucoma surgery combined with other ocular procedures (i.e. cataract surgery, penetrating keratoplasty, or retinal surgery) or anticipated need for urgent additional ocular surgery
• •17. Advanced glaucoma with MD \<-20dB