Certified Paraoptometric (CPO) Practice Exam

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What role does the cornea play in vision?

It generates tears

It helps focus light onto the retina

The cornea plays a crucial role in vision by helping to focus light onto the retina. It is the transparent front layer of the eye, and because of its curvature and refractive properties, it bends (or refracts) incoming light rays. This refraction is essential for forming clear images on the retina, where photoreceptor cells convert the light into neural signals that the brain interprets as visual information.

While the cornea does serve protective functions and is involved in light regulation, its primary responsibility in the context of vision is the focusing of light. Without the cornea's ability to effectively bend light, images would appear blurred, resulting in impaired vision. Thus, its primary focus on directing light accurately onto the retina is central to the process of sight.

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It protects the eye from dust

It regulates the amount of light entering the eye

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