PRP is used to check prism on a PAL; what does PRP refer to?

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Prepare for the Ophthalmic Optics Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

PRP is used to check prism on a PAL; what does PRP refer to?

Explanation:
PRP stands for the prism reference point—the small dot on a progressive lens that marks where prism is referenced during prism checks. This dot provides a stable reference location on the PAL so you can evaluate or align the prismatic effect accurately across the progressive surface. It’s not the pupil center, the optical center, or the lens edge—the PRP dot specifically indicates the reference point used for prism, making it the best answer.

PRP stands for the prism reference point—the small dot on a progressive lens that marks where prism is referenced during prism checks. This dot provides a stable reference location on the PAL so you can evaluate or align the prismatic effect accurately across the progressive surface. It’s not the pupil center, the optical center, or the lens edge—the PRP dot specifically indicates the reference point used for prism, making it the best answer.

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