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Thread: I need help..with this question!!

  1. #1
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    Confused I need help..with this question!!

    Here's the Question:

    Which Rx has the most vertical imbalance at reading level of 10mm below distance optical center:

    a, +2.00-0.50x90 b, -3.75-1.00x180 c, -6.50-2.25x90
    -1.50+0.50x180 +0.75+0.50x180 -1.50-1.75x90

    d, +8.25+1.50x90
    +3.50+1.00x180

    --- The answer was B, but i got C. I cant figure out how can it be? can u help me? THANKS..

  2. #2
    ATO Member HarryChiling's Avatar
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    A)
    OD +2.00 -0.50 x 090
    OS -1.50 +0.50 x 180

    Power on 90
    OD +2.00
    OS -1.00

    Prism
    OD 2 BU
    OS 1 BD

    Difference 3

    B)
    OD -3.75 -1.00 x 180
    OS +0.75 +0.50 x 180

    Power on 90
    OD -4.75
    OS +1.25

    Prism
    OD 4.75 BD
    OS 1.25 BU

    Difference 6

    C)
    OD -6.50 -2.25 x 090
    OS -1.50 -1.75 x 090

    Power on 90
    OD -6.50
    OS -1.50

    Prism
    OD 6.50 BD
    OS 1.50 BD

    Difference 5

    D)
    OD +8.25 +1.50 x 090
    OS +3.50 +1.00 x 180

    Power on 90
    OD +8.25
    OS +4.50

    Prism
    OD 8.25 BU
    OS 4.50 BU

    Difference 3.75

    Watch the signs in the Rx, that made this one tricky in a sense. The cyls were mixed whihc you sould hopefully never see i the real world, but for an exercise watch out.
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  3. #3
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    Ncle Test!!

    Helloo... I just passed my ABO and I've started preparing for the NCLE and plan to take it on this May! I've used the CD/wrkbk set frm OTI.. and ODR book to study for ABO.. and it worked well. But i'm concerned about the NCLE. I do've both the Contact Lens Manual & Test Revw for Ophth.Technicians! The manual seems real overwhelming! I was wondering if anyone of u'd used cd/wrk book set frm either OTI or NAO? :hammer:

  4. #4
    ATO Member HarryChiling's Avatar
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    Quote Originally Posted by mjacob View Post
    Helloo... I just passed my ABO and I've started preparing for the NCLE and plan to take it on this May! I've used the CD/wrkbk set frm OTI.. and ODR book to study for ABO.. and it worked well. But i'm concerned about the NCLE. I do've both the Contact Lens Manual & Test Revw for Ophth.Technicians! The manual seems real overwhelming! I was wondering if anyone of u'd used cd/wrk book set frm either OTI or NAO? :hammer:
    I used the CL manual from the CLSA and it as all I needed to pass it, the information was concise and seemed to be written fro the test so you won't find a better stdy guide. Good luck ad congras on the ABO.
    1st* HTML5 Tracer Software
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    *Dave at OptiVision has a web based tracer integration package that's awesome.

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