<prompt> All are true regarding optic neuritis except -Decreased visual acuityDecreased pupillary reflexAbnormal electroretinogramAbnormal visual evoked response retinogram  <response>: Electroretinogram indicates the activity of retinal esp. rods cones function and has no role in assessing the functional integrity of the optic nerve. So it cant be abnormal in optic neuritis.There is decreased visual acuity and abnormal pupillary reflex in optic neuritis. VER shows reduced amplitude and delay in transmission time. 