Designed for standardized visual acuity assessment, including Best Corrected Visual Acuity (BCVA), the Original Series ETDRS Sloan Letter Chart 2 uses proportionally spaced lines in the established ETDRS/LogMAR format for accurate and repeatable visual acuity measurement. Line sizes range from 13/131 to 13/6.5 (4/40 to 4/2) equivalent, with letter size, 20-foot, 6-meter, decimal, and LogMAR equivalents.

The standardized format has been used in National Eye Institute clinical studies and in low vision evaluations requiring consistent visual acuity measurement.

Compatible with the ESV3000™ ETDRS Clinical Trial Standardized Viewer and ESC2000™ Illuminated ETDRS Clinical Trial Cabinet.