Deep Sclerectomy Versus Trabeculectomy in Normal Tension Glaucoma

This study is comparing two surgical procedures for treating normal tension glaucoma (a type of glaucoma where the optic nerve is damaged even though eye pressure is in the normal range): deep sclerectomy (a surgery that creates a new drainage channel without fully opening the eye) versus trabeculectomy (the traditional glaucoma surgery). Researchers want to see which is safer and more effective. **You may be eligible if...** - You have been diagnosed with normal tension glaucoma (optic nerve damage with eye pressure below 22 mmHg) - Your glaucoma is worsening despite current medications - You have a stable eye assessment done by a glaucoma specialist - You speak Finnish, Swedish, or English **You may NOT be eligible if...** - You have secondary glaucoma (caused by injury, uveitis, or other eye conditions) - You have exfoliation syndrome or pigment dispersion syndrome - You have had previous glaucoma surgery or certain other eye surgeries - You have wet macular degeneration, diabetic retinopathy, or other major retinal conditions - You have dementia - Your only functioning eye has vision worse than 20/200 or loss of central visual field Talk to your doctor to see if this trial is right for you.