• Illustration developed by Steven Archer, MD; original illustration by Mark Miller.
    File Size: 117 KB
    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 1 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 1 eye to the other.