LogMAR Visual Acuity Test
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LogMAR Visual Acuity Test

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@RightfulEnjambment

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Questions and Answers

What is the equivalent of 6/60 in LogMAR?

  • 0.5
  • 0.02
  • 0.0
  • 1.00 (correct)

    • How many letters are represented at each level of acuity in LogMAR?

  • 10
  • 3
  • 1
  • 5 (correct)

    • What adjustment is made to LogMAR when testing at a distance of 2m?

  • Multiply by 0.5
  • Subtract 0.3
  • Add 0.1
  • Add 0.3 (correct)

    • What is the value of each line in LogMAR?

    <p>0.1</p> Signup and view all the answers

    What is the purpose of the Bailey-Lovie ETDRS chart?

    <p>To measure visual acuity</p> Signup and view all the answers

    What is the purpose of the Pelli-Robson chart?

    <p>To assess contrast sensitivity</p> Signup and view all the answers

    At what distance is the LogMAR vision test typically carried out?

    <p>4m</p> Signup and view all the answers

    How many letters are seen at each level of acuity in Snellen?

    <p>One letter</p> Signup and view all the answers

    What score indicates impaired contrast sensitivity in the Pelli-Robson chart?

    <p>Score of 1.5</p> Signup and view all the answers

    What is the advantage of LogMAR over Snellen?

    <p>LogMAR allows easy conversion when testing at a closer distance</p> Signup and view all the answers

    Study Notes

    Logarithm of the Minimum Angle of Resolution (LogMAR)

    • Developed by Bailey-Lovie for standardized vision testing.
    • 6/6 vision (normal acuity) is represented as 0.0 on the LogMAR scale.
    • 6/60 vision (poor acuity) corresponds to a LogMAR value of 1.00.
    • Individual letters contribute 0.02 to the LogMAR score.
    • Each line in the test contributes a value of 0.1 to the LogMAR score.
    • Conducted at a standard distance of 4 meters; each acuity level includes 5 letters, enhancing precision.
    • Unlike the Snellen chart, which displays only one letter for 6/60, LogMAR provides a more granular assessment.
    • Testing at a closer distance allows for easy conversion; a distance reduction by half requires adding 0.3 to the LogMAR value.

    Pelli-Robson Contrast Sensitivity Testing

    • Conducted at a distance of 1 meter using letter triplets.
    • A score of 2 out of 3 letters seen per triplet allows progression to the next triplet.
    • Each triplet contributes 0.15 to the contrast sensitivity score.
    • A perfect score of 2.0 indicates 100% contrast sensitivity.
    • A score of 1.5 suggests impaired contrast sensitivity.
    • Other contrast sensitivity tests include Vistech and MARS.

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    Description

    This quiz covers the LogMAR visual acuity test, including its application in the Bailey-Lovie ETDRS, calculation methods, and conversion to Snellen equivalent. Test yourself on the principles and calculations of LogMAR visual acuity measurement.

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