All are true regarding optic neuritis except:: (A) Decreased visual acuity, (B) Decreased pupillary reflex, (C) Abnormal electroretinogram, (D) Abnormal visual evoked response retinogram
Answer is C. 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 can&;t be abnormal in optic neuritis. Ref: AK khurana 7th ed.