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 term refers to the outer layer of the eyeball?

Sclera
Retina
Path
Papill

The correct answer is: Sclera

The outer layer of the eyeball is known as the sclera. It is a tough, protective layer that gives the eye its shape and also serves as an attachment point for the eye muscles. The sclera is white and fibrous, providing structural support to the eye and protecting the more delicate inner components, such as the retina, from external damage. The retina, on the other hand, is found deeper within the eye and is responsible for sensing light and sending visual signals to the brain. The term "path" does not relate to any specific structure of the eye, and "papill" may refer to the optic disc or a related term but is not a layer of the eyeball. Thus, the correct choice effectively identifies the protective outer layer of the eye.