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Learn moreYour glasses prescription will show you all of the details on the type of vision you have. Numbers indicate how strong lenses need to be and where they should be positioned within the frame.
If there is a number in the &#;PRISM&#; portion of your prescription, you have a weak eye muscle that needs correction. The &#;BASE&#; section will explain how the prism should be aligned.
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PRISM &#; diopters measure the amount of prism correction needed (from 0.5PD, 1.0PD, 1.5PD, and so on) and indicate how misaligned your eyes are. If the power required is high, it can be split into two since alignment is a function of both eyes.
BASE&#; depending on your double vision, the prism is placed vertically or horizontally in one or both lenses. It may be on the outer edge of the lens (Base Out, BO), the inner edge (Base In, BI), or at the top (Base Up, BU) or bottom edge (Base Down, BD).
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