Clinical Evaluation of Efficacy of SLT to Topical Medication in Lowering IOP

Inclusion Criteria: Diagnosis: POAG, PXF glaucoma, pigmentary glaucoma or mixed mechanism POAG with a narrow angle, (if laser PI \> 3 months ago) defined by standard examination criteria Adequate visualization of angle structures (i.e. clear media and cooperative patient) On no glaucoma medications OU \> 1 month On no systemic medications known to IOP (steroids) Visual acuity \> 6/24 OU Age - more than 35 yrs and less than 72 yrs Exclusion Criteria: A cumulative lifetime use of eye drops for glaucoma that exceeded 14 days; Used any eye drops for glaucoma in the 3 weeks before baseline I visit (washout from \< 14 days of use will be permitted); CIGTS visual field score that exceeds 16 in either eye; Evidence of ocular disease other than glaucoma that might affect the measurements of IOP, assessment of visual function, visual field testing Proliferative diabetic retinopathy Previous intraocular surgery one or both eyes except laser PI more than 3 months ago and cataract extraction with PC IOL more than 4 months ago. Undergone ophthalmic laser (other than laser PI \> 3 months ago), refractive, conjunctival, or intraocular surgery in either eye; Would likely require cataract surgery within 6 months of randomization Current or expected use of corticosteroids