In prism notation, what does BO stand for?

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Multiple Choice

In prism notation, what does BO stand for?

Explanation:
Base Out. In prism notation, the two-letter code tells you where the prism’s base (the thick edge) is located. BO means the base is toward the outer edge of the lens (the temple side). The other directions are Base In (toward the nose), Base Up (toward the brow), and Base Down (toward the chin).

Base Out. In prism notation, the two-letter code tells you where the prism’s base (the thick edge) is located. BO means the base is toward the outer edge of the lens (the temple side). The other directions are Base In (toward the nose), Base Up (toward the brow), and Base Down (toward the chin).

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