ETDRS Original Series Chart 2500015
The Adult Original Series ETDRS Sloan Letter vision chart 2 can be displayed in the ESV3000 illuminated cabinet. The chart features proportionally spaced (geometric progression) lines; line sizes range from 20/200 to 20/10 (6/60 to 6/3) equivalent. Features a standardized format used in National Eye Institute clinical studies and in Low Vision evaluations that require accurate and repeatable visual acuity measurements.
Dimensions: 24.5" x 25.5" (62 cm x 65 cm).
Testing distance: 13 feet/4 meters.Click here for the 500015 Answer Key.