Collection: ETDRS (LogMAR) Vision Test Charts

ETDRS is a type of visual acuity test that was developed as part of a large study of diabetic patients, called Early Treatment Diabetic Retinopathy Study. The test has a number of advantages over the previous types of acuity test, specifically the Snellen and Sloan tests. The ETDRS test incorporates equal acuity steps between testing lines, so that from row to row, the letter size changes by an equal 0.1 log unit per line. This equal change between lines creates different acuity levels than found on the previous tests, such as 20/16 vs 20/15 and 20/32 vs 20/30. This equal step on a logarithmic scale is the reason the test is often also referred to as a LogMAR test. In addition to equal steps between rows, the letters on each row are also spaced equally on a log scale. ETDRS tests are available for letters, numbers and symbols. And back-lit charts are available to standardize the testing luminance.

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  • ETDRS Low Contrast Letter Charts

    ETDRS Low Contrast Letter Charts

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    $82.95
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  • ETDRS Original Series Chart 1

    ETDRS Original Series Chart 1

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    $55.95
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    $55.95
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  • 2.5% ETDRS Sloan Letter Contrast Chart for 13 feet (4 meters)

    2.5% ETDRS Sloan Letter Contrast Chart for 13 feet (4 meters)

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    $82.95
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    $82.95
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  • ETDRS Original Series Chart R

    ETDRS Original Series Chart R

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    $55.95
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  • ESC2000 ETDRS Clinical Trial Kit with Original Series 13ft/4m ETDRS Charts

    ESC2000 ETDRS Clinical Trial Kit with Original Series 13ft/4m ETDRS Charts

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    $2,052.95
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  • ETDRS Original Series Chart 2

    ETDRS Original Series Chart 2

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    $55.95
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  • ESV3000 ETDRS Clinical Trial Kit with Original Series 13ft/4m ETDRS Charts

    ESV3000 ETDRS Clinical Trial Kit with Original Series 13ft/4m ETDRS Charts

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  • ETDRS Original Series Chart 2 for 10 feet/3 meters

    ETDRS Original Series Chart 2 for 10 feet/3 meters

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    $55.95
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  • Tumbling E ETDRS Chart

    Tumbling E ETDRS Chart

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    $55.95
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  • ESV3000 ETDRS Viewer Kit with 2000 Series 13ft/4m Charts and Floor Stand

    ESV3000 ETDRS Viewer Kit with 2000 Series 13ft/4m Charts and Floor Stand

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  • Tumbling E ETDRS Chart for ESV3000 and ESC2000

    Tumbling E ETDRS Chart for ESV3000 and ESC2000

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    $55.95
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  • ETDRS Original Series Chart R for 10 feet/3 meters

    ETDRS Original Series Chart R for 10 feet/3 meters

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    $55.95
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  • ETDRS 2000 Series Chart 1

    ETDRS 2000 Series Chart 1

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    $55.95
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  • 2.5% Landolt "C" Chart for 13 feet (4 meters) Scrambled

    2.5% Landolt "C" Chart for 13 feet (4 meters) Scrambled

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  • 2.5% Landolt "C" Chart for 13 feet (4 meters)

    2.5% Landolt "C" Chart for 13 feet (4 meters)

    Regular price
    $82.95
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    $82.95
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