Endoscopic Cyclophotocoagulation in Normal Tension Glaucoma

Who May Qualify: - Signed willing to sign a consent form - Normal Tension Glaucoma with typical nerve fiber layer defects in red-free photographs and/or optical coherence tomography (OCT) and possible equivalent visual field defects, IOP never more than 21 mmHg, and open anterior chamber angle - Glaucoma stable with current medication assessed by a glaucoma specialist - Clinically significant cataract Who Should NOT Join This Trial: - Secondary Glaucoma e.g. due to previous injury or uveitis - Exfoliation syndrome - Pigment dispersion syndrome - Previous transscleral or endoscopic cyclophotocoagulation - Previous other glaucoma surgery - Cataract due to eye injury or congenital cataract - Zonular weakness due to Marfan syndrome or other - Previous retinal detachment - Previous intraocular surgery like vitrectomy and other retinal surgery - Wet age-related macular degeneration - Diabetic retonopathy - Previous corneal transplant or previous refractive surgery - Fuchs' dystrophy and other abnormalities compromising corneal clarity like scars - The patient does not want to participate in the study - The glaucoma progresses on current IOP - The patient does not speak Finnish, Swedish or English - Dementia - Only eye with vision worse than 20/200 or loss of central visual field Always talk to your doctor about whether this trial is right for you.