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.