Certified Paraoptometric (CPO) Practice Exam 2025

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What does "vertex distance" describe?

  1. The distance from the front of the eyewear to the eye

  2. The thickness of the lens at the edges

  3. The distance from the back of the lens to the cornea

  4. The space between the frame and the temple

The correct answer is: The distance from the back of the lens to the cornea

The term "vertex distance" specifically refers to the distance from the back of the lens to the cornea. This measurement is critical in optometry and eyewear fitting because it affects the effective power of the lenses being used. As the distance changes, it can impact how light is focused by the lens onto the retina, influencing the overall visual acuity experienced by the wearer. Understanding vertex distance is essential for ensuring that prescriptions are accurately filled and that patients receive lenses that provide optimum visual correction. In some cases, if the vertex distance is not accurately measured or maintained, it can lead to visual distortions or discomfort for the wearer. The other options deal with other aspects of eyewear and lens fitting, but they don't capture the specific meaning of "vertex distance."

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