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Thread: Take a Master Exam

  1. #126
    ABOM Wes's Avatar
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    Quote Originally Posted by onthegrind View Post
    Ans for Ques 17 is a) 71mm. Reason: MBS = (frame PD/geometric center distance - person PD) + ED. mbs = ((54 +16) - 64) + 64. mbs = (70-64) + 64. mbs = 6 + 64 = 70. 71mm is within 1mm tolerance

    Nope. You didn't account for the 1.5 diopters of base in prism in the Rx. You'd decenter each eye OUT from the PRP/Patient PD to induce the prism, making the blank requirement 6mm LESS than what you calculated.

  2. #127
    OptiBoard Apprentice
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    yeah, i see it. one of those questions where the answer is more than just the formula.

  3. #128
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    Wow, what a thread this is, refreshing my memory. I really need to study

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