Certified Paraoptometric (CPO) Practice Exam 2025

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Gear up for the Certified Paraoptometric (CPO) Exam 2025. Study with interactive quizzes and multiple-choice questions with comprehensive explanations. Excel in your exam with our tailored preparation tools!

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Which lens type is primarily used to correct astigmatism?

Spherical lens
Cylindrical lens
Plus lens
Minus lens

The correct answer is: Cylindrical lens

The cylindrical lens is primarily used to correct astigmatism because it has a specific curvature that helps compensate for the irregular shape of the cornea or lens in the eye, which leads to astigmatism. This type of lens focuses light differently in one meridian than in another, allowing for improved vision by aligning the light rays correctly on the retina. Spherical lenses, on the other hand, have the same curvature in all directions and are typically used to correct myopia (nearsightedness) or hyperopia (farsightedness) rather than astigmatism. Plus and minus lenses refer to the power of the lenses for hyperopia and myopia, respectively, but do not specifically address the unique correction needed for astigmatism. Thus, cylindrical lenses are essential for providing the necessary adjustments for this refractive error.