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Thread: Does it means 0.75 base In prism in OD?

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    Does it means 0.75 base In prism in OD?

    I attached a picture. The RX is from UK.
    Does it mean 0.75 Base In prism in OD?
    The lab can make 0.25 prism diopter?
    Attached Thumbnails Attached Thumbnails IMG_20230116_231007.jpg  

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    What's up? drk's Avatar
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    That's what I read it as: "add 0.75^ BI right eye, please".

    I think it's safe to do a 1^ if that's too exact for the lab.

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    0.75 BI OD

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    OptiBoard Apprentice JGor's Avatar
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    I read that as 0.75 BI for the RE.
    Just by the by you can get that amount of prism by decentering the lens with that Rx depending on PD and frame size. Decenter the lens by approximately 1.3mm OUT to achieve base in prism for that power.
    Last edited by JGor; 01-18-2023 at 02:27 AM. Reason: adding more info

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