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What does Prentice's formula calculate?

Decentration
Lens power
Prism effect
Field of view

The correct answer is: Prism effect

Prentice's formula is specifically used to calculate the prism effect induced by a lens when it is decentered from the optical center. The formula is given as P = c * F, where P represents the prism diopters, c is the decentration in centimeters, and F is the lens power in diopters. This relationship allows opticians to determine how much prism is created due to the misalignment of a lens in relation to the line of sight, which is crucial for ensuring proper visual alignment and comfort for the patient. Understanding the prism effect is essential in the field of optometry and optical dispensing, as it directly influences how light is directed towards the retina, affecting binocular vision and alignment. By knowing how to apply Prentice's formula, opticians can accurately compensate for this effect, which is vital when fitting glasses or managing certain eye conditions.