Sudden loss of vision, absent Ipsilateral direct light reflex and normal ipsilateral consensual light reflex suggest the diagnosis of optic nerve injury. Within 8 hours of injury megadose of iv steroid (methylprednisolone) should be given. If there is no response or deterioration, optic canal decompression should be done. If vision is improving, steroids should be tapered gradually. If on tapering steroids, vision deteriorates, optic canal decompression is indicated.