What is the name of the formula used to calculate induced prismatic effect caused by spectacle lenses?

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The formula used to calculate the induced prismatic effect caused by spectacle lenses is known as Prentice's rule. This rule helps in determining the amount of prism that a lens can create at a certain distance from the optical center. Specifically, Prentice's rule states that the amount of induced prism is equal to the power of the lens (measured in diopters) multiplied by the distance (in centimeters) from the optical center of the lens to the point where the light enters the lens. This calculation is crucial for optometrists and opticians to ensure that patients do not experience unwanted prismatic effects, which can lead to visual discomfort. Understanding this rule is essential for proper lens fitting and prescription adjustments.

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