These stereo fly with lea symbols have been developed and tested by the same team that has long published the various Insect Polarized Tests, however, these new versions have some very important new features as shown. They each come with a high quality pair of stereo glasses. Fly and butterfly tests designed to rapidly access amblyopia & strabismus using gross thru fine stereopsis new features:
* Now tests down to 20 seconds of arc
* Employs familiar LEA Symbols™ for basic 400, 200 and 100 levels
* Answer key cannot be lost - printed on the back cover Still Includes:
* Tests for 4800 to 20 sec of arc
* No Monocular Clues
* Includes Polarized glasses.