• Transcleral cyclophotocoagulation (TSCPC) has long been used as refractory glaucoma management and is very easy to learn and easy to perform.
• Recent advances in laser technology; the role of TSCPC is being expanded because it has benefits of noninvasive glaucoma procedure.
• The titration (pops), the fixed high-energy, and the fixed-low energy (slow-coagulation) are three energy delivery techniques.
• The present study would report on the outcome (efficacy and safety) of the slow-coagulation versus the titration method in treatment of refractory glaucoma with dark iris.
• The results would provide reliable evidences to supplement clinical judgment when making a decision in favor of each treatment method for glaucoma patients.

• Several protocols afford delivery of the "optimum" dose of laser energy per session necessary to achieve a long-term effective ocular hypotensive response balancing risks related to a high energy treatment and risks related to retreatment due to suboptimum dose delivery.
• There are two main approaches to delivering laser energy, the pops-titration method and the fixed energy method that are the fixed-high and low-energy (the Gaasterland's slow-coagulation technique).
• Of particular interest is which laser energy delivery method (slow-coagulation versus pops-titration) affords the optimal dose of photocoagulation necessary to achieve an effective long-term intraocular pressure (IOP) reduction while minimizing the risk of adverse events related to overtreatment and retreatments especially in refractory glaucomatous eyes with dark iris color.

Inclusion Criteria:

• Refractory glaucoma (Neovascular glaucoma) with
• Eyes with no visual potential and very high intraocular pressure (on maximal medical treatment) in which the intraocular pressure will probably cause corneal complications
• Eyes with no visual potential and very high intraocular pressure (on maximal medical treatment) in which the intraocular pressure cause eye pain and need pain relief
• Eyes with minimal useful vision and intraocular pressure over the target intraocular pressure
• Eyes in which trabeculectomy with mitomycin-C and/or drainage implants have a high probability of failure
• Eyes in which trabeculectomy with mitomycin-C and/or drainage implants have previously failed
• Patient refuses to undergo more aggressive intraocular surgery
• Patients whose general medical condition precludes invasive surgery

Exclusion Criteria:

• The visual acuity in the fellow eye is no light perception
• Have previously been treated by the transcleral cyclophotocoagulation
• Allergy to anesthetic medication
• Can not measure the intraocular pressure by the applanation method