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Thread: problem regarding prism

  1. #1
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    problem regarding prism

    I am having some problems doing the following question. Any help would be really appreciated.

    The following thin prisms are placed in close contact before the right eye;

    8 base 45
    2 base 270
    3 base 180

    Find the power and base direction of the single prism which will replace the combination.

  2. #2
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    Wait for more answers, i´m not sure.

    Darryl/Harry will this be right?:

    8 base 45 = 5,66 base 0 - 3 base 180 = 2,66 base 0
    5,66 base 90 - 2 base 270 = 3,66 base 90

    2,66 base 0
    3,66 base 90

    Result prism = 4,5 Base 54

  3. #3
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    3.7 @ 80?

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    Uodate

    Your answer is 4.52 prism D at 54 degrees.
    Last edited by gimbelf; 05-13-2011 at 02:58 PM.

  5. #5
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    And the winner is... 4.52 at 54!

  6. #6
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    prisms are very hard to understand. I am very nervous about taking my abo test tomorrow. SIGH. FML.

  7. #7
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    fantastic! Thank you so much! I also got 4.5 at 54 !!!

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