ETDRS Original Series Chart 2500015
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The Adult Original Series ETDRS Sloan Letter vision chart 2 can be displayed in the ESV3000 illuminated cabinet. This chart features proportionally spaced (geometric progression) lines; line sizes range from 13/131 to 13/6.5 (4/40 to 4/2) equivalent. The other equivalents include letter size, 20 foot, 6 meter, decimal, and LogMAR. Features a standardized format used in National Eye Institute clinical studies and in low vision evaluations that require accurate and repeatable visual acuity measurements.
This chart can also be used in an ESC2000 Illuminated ETDRS Clinical Trial Cabinet.
Dimensions: 24.5" x 25.5" (62 cm x 65 cm).
Testing distance: 13 feet/4 meters.Click here for the 500015 Answer Key.