12-24-2013, 04:13 PM
could anyone explain this question to me?
not just the answer
A 52-year-old man is brought to the physician 3 days after the sudden onset of blindness of the left eye. He does not have any eye pain. Funduscopy of the left eye shows a pale, opaque fundus and a bright red fovea centralis. Visual field testing shows a dense scotoma of the entire visual field of the left eye; testing of the right eye shows no abnormalities. At a follow-up examination 6 months later, the patient remains blind in the left eye. If the left eye is illuminated, which of the following reactions is mostly likely in the right pupil of this patient?
A) Constriction because the left optic tract is binocular
B) Constriction because projections to the Edinger-Westphal nucleus are bilateral
C) Dilation because the posterior commissure is intact
D) Dilation because the right superior cervical ganglion is intact
E) No constriction because the left ciliary nerve has been permanently damaged
F) No constriction because the retinal ganglion cells in the left eye have been destroyed.
not just the answer
A 52-year-old man is brought to the physician 3 days after the sudden onset of blindness of the left eye. He does not have any eye pain. Funduscopy of the left eye shows a pale, opaque fundus and a bright red fovea centralis. Visual field testing shows a dense scotoma of the entire visual field of the left eye; testing of the right eye shows no abnormalities. At a follow-up examination 6 months later, the patient remains blind in the left eye. If the left eye is illuminated, which of the following reactions is mostly likely in the right pupil of this patient?
A) Constriction because the left optic tract is binocular
B) Constriction because projections to the Edinger-Westphal nucleus are bilateral
C) Dilation because the posterior commissure is intact
D) Dilation because the right superior cervical ganglion is intact
E) No constriction because the left ciliary nerve has been permanently damaged
F) No constriction because the retinal ganglion cells in the left eye have been destroyed.