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> The butterfly stereo test with lea symbols®
The butterfly stereo test with lea symbols®
Butterfly Stereopsis Test with LEA Symbols
Designed to rapidly test for amblyopia and strabismus using gross thru fine stereopsis (2500 to 20 seconds of arc). Graded circle test from 400 seconds now down to 20 seconds with no monocular clues. New improved booklet has answer key on back cover and includes polarized viewers.
