<prompt> All are true regarding optic neuritis, EXCEPT:Decreased visual acuityDecreased pupillary reflexAbnormal electroretinogramAbnormal visual evoked response retinogram  <response>: Optic neuritis is inflammation and demyelination of optic nerve. Electroretinogram is therefore not abnormal in optic neuritis. Ref: Parsons Diseases of the Eye, Page 114 ; Comprehensive Ophthalmology By A K Khurana, 4th Edition, Pages 294-5, 488-9 