How to determine resultant prism?

how to determine resultant rism in ophthalmic
prescriptions?

Answers:
360° resultant prism can be calculated with the following equation:

R = Sqrt( V^2 + H^2 )

Where V is the vertical prism and H is horizontal prism.

The resultant angle can be calculated using this equation:

Tan(θ) = V/H
you have to multiply base times hight times length
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