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 primary function of aqueous humor?

Protects the lens from damage
Provides nutrients for the lens and posterior cornea
Helps the eye maintain its shape
Supports the retina's connection to the cornea

The correct answer is: Provides nutrients for the lens and posterior cornea

The primary function of aqueous humor is to provide nutrients for the lens and the posterior cornea. This clear fluid fills the anterior and posterior chambers of the eye, which are located between the cornea and lens. Aqueous humor is vital for delivering essential nutrients, such as glucose and amino acids, to these avascular tissues, which lack direct blood supply. Additionally, it plays a significant role in maintaining intraocular pressure, which is crucial for the overall health and functionality of the eye. While protecting the lens or maintaining eye shape are important aspects of ocular health, they do not capture the primary role of aqueous humor as effectively as its nutrient supply function. Supporting the retina's connection to the cornea is not a direct role of aqueous humor either, as the vitreous humor primarily supports the retina. Therefore, providing nutrients is the most accurate characterization of the main function of aqueous humor.