<prompt> A 25 year-old-male presents with sudden painless loss of vision. The ocular and systemic examination is normal. What is probable diagnosis?Retinal detachmentEales diseaseGlaucomaOptic neuritis  <response>: Optic neuritis is an inflammatory, demyelinating condition that causes acute, usually monocular, visual loss. Most cases of acute demyelinating optic neuritis occur in women two-thirds and typically develop in patients between the ages of 20 and 40. 