Stereopsis Butterfly Test - Standard101055
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A stereopsis test featuring basic shapes and a butterfly that is 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 the back cover
- Includes polarized viewers