A 75–year old patient presents with deterioration of vision. On examination the pupillary reflex is observed to be sluggish and the Intraocular pressure is normal. Optic disc evaluation shows a large and deep cup and primarily shows paracentral scotomas. The most likely diagnosis is –: (A) Primary Narrow Angle glaucoma, (B) Normal Tension Glaucoma, (C) Neovascular Glaucoma, (D) Absolute Glaucoma
Answer is B. Glaucomatous cupping (large and deep cup) along with glaucomatous visual field defect (paracentral scotomas are the most frequent) in a patient with normal intraocular pressure suggest a diagnosis of Normal Tension Glaucoma (NTG).