Certified Paraoptometric (CPO) Practice Exam 2025

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What is the meaning of "pupillary distance"?

  1. The width of the frame

  2. The height of the lens opening

  3. The distance between the centers of the pupils

  4. The distance from the cornea to the lens

The correct answer is: The distance between the centers of the pupils

The meaning of "pupillary distance" refers specifically to the distance between the centers of the pupils of the eyes. This measurement is crucial for various optical purposes, including ensuring that lenses are properly aligned with the eyes when creating eyeglasses. Accurate pupillary distance helps optimize vision by allowing light to enter the lenses in a way that aligns perfectly with each pupil, thereby enhancing visual comfort and clarity. In optical fittings, understanding pupillary distance is fundamental because any deviation can lead to discomfort or visual distortion. It is a key factor when crafting customized lenses to ensure they match an individual's unique eye positioning.

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