An optic nerve injury may result in all of the following except.
Ans. is 'c' i.e. Ptosis Ptosis is not seen in optic nerve injury. It is the drooping of upper eyelid d/t the paralysis or defective development of LPS. LPS is supplied by oculomotor N (III N)About other options:Optic nerve carries different fibres for both visual pathway and light reflex. So an injury to the optic n. will obviously result in loss of vision and loss of light reflex.About option B (i.e. dilatation of pupil)In text book of head injury by A.K. Mahapatra it's written that Optic nerve injury can lead to dilatation of pupil. "when a patient is unconscious, unilateral fixed dilated pupil with retained consensual light reflex raises the possibility of unilateral optic nerve injury (Marcus Gunn Pupil)."
Loss of vision in that eye.
Dilatation of pupil.
Ptosis
Loss of light reflex.
Optic Nerve