visual deficit - zkadhem

[ArchivalUser]

1-3. Calcification of the internal carotid artery, which impinges upon the lateral half of the right optic nerve prior to its entrance to the brain of a 68-year-old woman, results in certain visual deficits. The most likely visual deficits will be
a. Total blindness of the right eye
b. Right nasal hemianopsia
c. Right homonymous hemianopsia
d. Right bitemporal hemianopsia
e. Right upper homonymous quadrantanopia

[ArchivalUser]

bb

[ArchivalUser]

bbb?

[ArchivalUser]

b?

[ArchivalUser]

1-3. The answer is b.
Calcification of the internal carotid artery could serve to disrupt nerve fibers proximal to it. One such group of fibers includes parts of the optic nerve. In this case, the component of the right optic nerve affected includes the lateral aspect, or those fibers that mediate vision associated with the nasal visual field of the right eye. If the damage were more extensive and if it involved the entire nerve,then total blindness of the right eye would have occurred.