First sign of optic nerve disease is:: (A) Papilloedema, (B) Colour blindness, (C) Afferent pupillary defect, (D) Efferent pupillary defect
Answer is C. C i.e. Afferent pupillary defect Marcuss Gunn pupil or RAPD (relative afferent papillary defect) is the earliest indication of optic nerve disease even in presence of normal visual acuity.Q