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Jackson Cross Cylinder (JCC Part 2)

Quiz by Raja Liyana

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5 questions
Show answers
  • Q1
    Fine tune BVS, (add _______ to BVS or duochrome one step on ________ )
    -0.25DS, Red
    -0.25DS, Green
    +0.25DS, Green
    +0.25DS, Red
    120s
  • Q2
    When refining cylinder axis, position of JCC, ________align with the axis of trial cylinder
    red line
    black line
    handle of JCC
    axis of JCC
    120s
  • Q3
    When refining cylinder power, position of JCC: ________align with the axis of trial cylinder
    Handle of JCC
    Axis of JCC (Red/Black line)
    White dots
    120s
  • Q4
    In order to keep the COC on retina, the rule is:
    for every −0.50DC added, put in −0.25DS.
    for every −0.50DC added, put in +0.25DS.
    for every −0.25DC added, put in +0.50DS.
    for every −0.25DC added, put in −0.50DS.
    120s
  • Q5
    After Retinoscopy: OD: -2.50 DS VA 6/12 BVS: -3.25 DS VA 6/7.5 What is the technique using JCC to check whether px has astigmatism?
    Bracketting
    +1.00 Fog
    Pinhole test
    BVS
    120s

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