Stereopsis Butterfly Test - Standard

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