Tumbling E, Sloan Letter, Astigmatism & Vergence Projector Slide
Projector Slide featuring Astigmatism & Vergence. Tumbling E from 20/400 to 20/200, Sloan Letters from 20/100 to 20/10, Astigmatic Clock Test, Vertical Lines for Vergence from 20/40 to 20/10, Sloan Letters from 20/50 to 20/10, and Astigmatic Blocks.