<prompt> 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 paracentral scotomas. The most likely diagnosis is:Primary Narrow angle glaucomaNormal Tension GlaucomaNeovascular GlaucomaAbsolute Glaucoma  <response>: Ans. b Normal Tension GlaucomaRef: Kanski 7e, p. 346; Yanoff 3e, p. 1159Glaucomatous cupping large and deep cup along with glaucomatous visual field defects paracentral scotomas are the most frequent in patients with normal intraocular pressure suggests a diagnosis of Normal Tension Glaucoma NTG. 