A 37-year-old woman is brought to the emergency department b

[madhurima]

A 37-year-old woman is brought to the emergency department because she has been unable to see out of her right eye since awakening 2 hours ago. She states that any movement of the eye is painful. Examination shows visual acuity of 20/200 in the right eye and 20/20 in the left eye. The optic fundi are normal. The left pupil reacts normally to light. The right pupil is poorly reactive to direct light. The remainder of the eye examination shows no abnormalities. Which of the following is the most likely site of the lesion?

A ) Left optic nerve

B ) Left optic radiation

C ) Left optic tract

D ) Left visual cortex

E ) Optic chiasm

F ) Retina

G ) Right optic nerve

H ) Right optic radiation

I ) Right optic tract

J ) Right visual cortex

[madhurima]

The lesion at retina to optic nerve level can affect both eyes, direct light reflex in lesion eye and indirect reflex in good eye. IT is impossible to have a intact direct and indirect light reflex in one eye if the other eye's optic nerve is damaged.