4 Meter 2000 Series Revised ETDRS Chart "1" from Precision Vision®

  • 4 Meter 2000 Series Revised ETDRS Chart "1"

Description

This "revised" ETDRS chart incorporates a slight change in difficulty score for each of the ten Sloan optotypes. These difficulty levels were derived from the best corrected visual acuity examinations of 7,420 eyes during the ETDRS study. The difficulty scores from the "original" charts were derived from the examination of 234 eyes. This further testing helped to pinpoint difficulty levels and further calibrate this already reliable test.
  • Product Specs
  • Item4 Meter 2000 Series Revised ETDRS Chart "1"
  • CompanyPrecision Vision®
  • Price Inquire
  • Features
    • For testing at 4 meters (13 ft.)
    • Acuity range 40M to 2M (20/200, 6/60 to 20/10, 63 equiv.)
    • Measures 62 X 65 cm (24.5 X 25.5 in.)
    • Fits ETDRS Illuminator Cabinet CAT. NO. 2425
    • Can also be wall-mounted
    • Printed on high-impact polystyrene
  • ApprovalUSA
  • Product Number2121
  • Chart Number1
  • Testing Distance4 meters (13 ft.)
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