Stereopsis Butterfly with LEA SYMBOLS®
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