A Marcus-Gunn effect involves:
A. Abnormal pupillary responses
B. Abnormal visual acuity
C. Abnormal funduscopic findings
D. All of the above
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.
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