CLINICAL-MARCUS GUNN PUPILLARY SIGN

SUMMARY

1. Also termed RELATIVE AFFERENT PUPILLARY DEFFECT (RAPD).

2. If an eye has optic atrophy or severely reduced visual acuity, the affected pupil will dilate paradoxically if light is moved away from the normal eye to the abnormal eye.

3. This occurs due to an intact consensual response from the normal eye and diminshed afferent response in the abnormal eye.

Reference(s)

Wilkinson, I., Furmedge, D. and Sinharay, R. (2017). Oxford handbook of clinical medicine. Oxford: Oxford University Press. Get it on Amazon.
Feather, A., Randall, D. and Waterhouse, M. (2020). Kumar And Clark’s Clinical Medicine. 10th ed. S.L.: Elsevier Health Sciences. Get it on Amazon.
Hannaman, R. A., Bullock, L., Hatchell, C. A., & Yoffe, M. (2016). Internal medicine review core curriculum, 2017-2018. CO Springs, CO: MedStudy.
Therapeutic Guidelines. Melbourne: Therapeutic Guidelines Limited. https://www.tg.org.au [Accessed 2021].