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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What happens to the cornea in keratoconus?

It becomes opaque.
It changes to an irregular cone shape.
It develops a scar.
It shrinks in size.

The correct answer is: It changes to an irregular cone shape.

In keratoconus, the cornea undergoes a transformation that leads to an irregular cone shape. This condition results from a thinning and steepening of the corneal tissue, which causes the normally dome-shaped cornea to bulge outward and take on a conical form. This distortion significantly affects vision, as it leads to irregular astigmatism and changes in refractive power. While some of the other provided choices may describe changes that can occur to the cornea in different conditions, they do not accurately represent the specific changes associated with keratoconus. The primary characteristic of keratoconus is indeed the alteration in shape of the cornea to a cone-like structure.