Visual acuity / Humans / Glaucoma / Intraocular Pressure / American / Randomized Trial / Clinical Sciences / Optometry and Ophthalmology / Public health systems and services research / Randomized Clinical Trial / Trabeculectomy / Mitomycin / Best Corrected Visual Acuity (BCVA) / Randomized Trial / Clinical Sciences / Optometry and Ophthalmology / Public health systems and services research / Randomized Clinical Trial / Trabeculectomy / Mitomycin / Best Corrected Visual Acuity (BCVA)