Certified Paraoptometric (CPO) Practice Exam 2025

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Prepare for the Certified Paraoptometric Exam with our comprehensive quiz featuring multiple-choice questions. Each question is accompanied by hints and explanations, helping you build your knowledge and confidence. Get ready to excel in your career!

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What is the role of the choroid in the eye?

It acts as a protective layer
It nourishes the retina
It helps in focusing light
It pumps aqueous humor

The correct answer is: It nourishes the retina

The choroid plays a crucial role in nourishing the retina. It is a vascular layer located between the retina and the sclera (the white outer layer of the eyeball), containing a rich network of blood vessels. These vessels supply essential nutrients and oxygen to the outer layers of the retina, which are critical for the maintenance and function of photoreceptors. This nourishment helps ensure that the retinal cells remain healthy and capable of performing their functions in vision. While the choroid does provide some protective benefits and contributes to the overall health of the eye, its primary and most critical role is to support the metabolic needs of the retina, making it vital for visual processing.