LEA Butterfly with LEA Symbols

Art.nr L101050 
LEA Butterfly with LEA Symbols
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Stereopsis test combining both butterfly and LEA Symbols designed to rapidly test for amblyopia & strabismus using gross thru fine stereopsis (2500 to 20 sec of arc).
    Graded circle test from 800 sec now down to 20 sec
    No monocular clues
    New improved booklets
    Answer key on back cover
    Includes polarized viewers