cover-uncover test

[kŭvər-ŭn-kŭvər]
n.
  1. A test to detect strabismus in which one eye focusing on a given point is covered; if the uncovered eye moves, strabismus is present.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.