Author Question: A patient describes a brief episode of visual impairment where it was as if a dark shade was ... (Read 28 times)

dmcintosh · **on:** Jun 25, 2018

A patient describes a brief episode of visual impairment where it was as if a dark shade was gradually coming down over one eye. The vision returned a moment later. This is most commonly described in which condition?

A. Glaucoma
B. Cataracts
C. Amaurosis fugax
D. Macular degeneration

Question 2

A Marcus-Gunn effect involves:

A. Abnormal pupillary responses
B. Abnormal visual acuity
C. Abnormal funduscopic findings
D. All of the above

perkiness · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

ANS: C
In amaurosis fugax, the patient often describes an episode as if a shade had been pulled over one eye in a descending fashion and then, a short time later, the shade was raised and vision restored.

Answer to Question 2

ANS: A
Note whether the pupil response is a slight constriction, slightly more pronounced with direct light, which is normal, or the pupil slightly relaxes so that the response is slightly less pronounced with direct light, which is an abnormal, Marcus-Gunn effect.