Certified Paraoptometric (CPO) Practice Exam 2025

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Which of the following descriptions matches the vitreous humor?

  1. A thin fluid layer in front of the retina

  2. A jelly-like substance that supports the retina

  3. The outermost layer of the eye

  4. A fibrous tissue that forms the cornea

The correct answer is: A jelly-like substance that supports the retina

The vitreous humor is accurately described as a jelly-like substance that supports the retina. It fills the space behind the lens and in front of the retina, providing structural support and maintaining the shape of the eyeball. This gel-like consistency helps to keep the retina in place, ensuring that it remains properly positioned against the inner surface of the eye, which is crucial for optimal visual function. The other descriptions do not accurately represent the vitreous humor. A thin fluid layer in front of the retina would be more characteristic of the aqueous humor, which is found in the anterior chamber and helps nourish the eye. The outermost layer of the eye refers to the sclera or cornea, not the vitreous humor. Lastly, fibrous tissue forming the cornea pertains to the corneal structure, which safeguards the interior of the eye and contributes to its refractive properties, distinct from the jelly-like nature of the vitreous humor.

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