Saenger's sign

Saeng·er's sign

(zĕng′ərz)
n.
An indication of cerebral syphilis in which the loss of the light reflex of the pupil returns after a short time in the dark.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.