Evaluation of Different Perimetric Grids to Detect Central Visual Field Defect in Glaucoma Patients With Reduce Ganglion Cell Layer Thickness Measured by Spectral Domain OCT.

This study is comparing different types of visual field tests to find the best way to detect central vision loss in patients with glaucoma. Researchers are using eye scans (OCT) to measure nerve cell thickness alongside the vision tests. **You may be eligible if...** - You have been diagnosed with glaucoma with signs of optic nerve damage - Your OCT scan shows reduced thickness of the ganglion cell layer in your eye **You may NOT be eligible if...** - You are under 18 years old - You cannot read, understand, or sign the consent form - You cannot perform a visual field test - Your glaucoma is very advanced (cup-to-disc ratio over 0.7) - You have other causes of optic nerve damage, retinal diseases, or significant cataracts/corneal clouding - You have a significant refractive error (nearsightedness/farsightedness over ±6D, or astigmatism over ±3D) Talk to your doctor to see if this trial is right for you.