A Dr. Louis Cantor, MD, Ophthalmology, answered on behalf of American Academy of Ophthalmology's EyeSmart. Normal-pressure glaucoma is diagnosed when the eye pressure is within the normal range of approximately 10 to 21 mm Hg but there is still evidence of the typical optic-nerve damage and vision loss seen in glaucoma. Dr. Louis Cantor, MD, Ophthalmology, answered on behalf of American Academy of Ophthalmology's EyeSmart. Normal-pressure glaucoma is diagnosed when the eye pressure is within the normal range of approximately 10 to 21 mm Hg but there is still evidence of the typical optic-nerve damage and vision loss seen in glaucoma.