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Thread: Measuring PD for Prism RX and Wandering Eye

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    Confused Measuring PD for Prism RX and Wandering Eye

    Hello everyone. I can't find the answer to my question anywhere and I need some help. I have a pt who is a SVD and has and rx of +1.75 -0.50 176 2BI prism and +0.50 w/2BI prism. The OD eye measures 35 at infinity on a pupilometer and moves to a 33 when the OS is occluded. Pt's OD eye tends to wander due to a medical event. Which PD should I use the for the OD, 33 or 35, and why please? My instinct was to use the 35 since that's how his eye tends to go towards as most people aren't walking around with one eye closed.

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    Quote Originally Posted by Crystalpluto View Post
    Hello everyone. I can't find the answer to my question anywhere and I need some help. I have a pt who is a SVD and has and rx of +1.75 -0.50 176 2BI prism and +0.50 w/2BI prism. The OD eye measures 35 at infinity on a pupilometer and moves to a 33 when the OS is occluded. Pt's OD eye tends to wander due to a medical event. Which PD should I use the for the OD, 33 or 35, and why please? My instinct was to use the 35 since that's how his eye tends to go towards as most people aren't walking around with one eye closed.
    If the eye wanders you don’t know where the patient will be looking so go in between the two readings. It will have a negligible effect on the prism. The manufacturing tolerance for pd is more than your measuring concerns might create. .

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    Welcome to Optiboard Crystalpluto!

    What was the medical event? I always try to note this and best corrected acuity especial for the wandering eye.

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    a stroke

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