Illustration developed by Steven M. Archer, MD; original illustration by Mark Miller.
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Pediatric Ophth/Strabismus
A,The alternate cover test. Top: Exotropia, left eye fixating. Middle and bottom: Both eyes move each time the cover alternates from one eye to the other. B, The prism alternate cover test. Top: The exotropia is neutralized with a prism of the correct power. Middle and bottom: The eyes do not move as the cover alternates from one eye to the other.