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 is the function of the lens in the eye?

To detect light
To control pupil size
To focuses image of an object on the retina
To protect the inner eye

The correct answer is: To focuses image of an object on the retina

The lens in the eye plays a pivotal role in focusing images. Its primary function is to bend (refract) light rays that enter the eye so that they converge on the retina, creating a clear image of the objects we see. This ability to change shape, known as accommodation, allows the lens to adjust its curvature depending on the distance of the object, enabling us to see both near and far clearly. While other options mention functions related to the eye, they are not the primary role of the lens. The retina is responsible for detecting light, the iris controls the size of the pupil to regulate light entry, and structures like the cornea and sclera provide protection, but none of these are functions of the lens itself. Thus, focusing the image of an object on the retina is indeed the correct function associated with the lens.