A 75-year old patient present 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:
Ans. Normal tension glaucoma
Primary narrow angle glaucoma
Normal tension glaucoma
Neovascular glaucoma
Absolute glaucoma