Question

Which of the following statements is correct regarding cornea?

• A. The cornea consists of a dense matrix of collagen and is the most sensitive portion of the eye.
• B. The cornea is an external, transparent, and protective proteinaceous covering of the eye-ball.
• C. The cornea consists of dense connective tissue of elastin and can repair itself.
• D. The cornea is a convex, transparent layer that is highly vascularised.

Answer 1

The correct option is B

The cornea is an external, transparent, and protective proteinaceous covering of the eye-ball.

The correct option is B.

Explanation of the correct option:

1. The transparent front portion of the eye that protects the pupil, iris, and the anterior chamber is called the cornea.
2. It is transparent, permits light to flow through, refracts, and focuses on the lens.
3. It helps with adequate light focusing so that a clean image may be created.
4. It is a sensitive area of the eye because it is proteinaceous and contains unmyelinated nerve endings.
5. This area is translucent and has no blood vessels.
6. Because of the oxygenation, the cornea works and is in good condition.

Explanation of the incorrect options:

Option A:

1. The cornea is composed of a soluble protein known as albumin and it is not the most sensitive portion of the eye.
2. Thus, it is an incorrect option.

Option C:

1. The cornea is the most sensitive portion of the eye because it contains unmyelinated nerve endings.
2. This layer lacks blood vessels due to its transparency.
3. The oxygen keeps the cornea healthy.
4. Any injury to the cornea can result in blurred vision.
5. Thus, it is an incorrect option.

Option D:

1. The lens is the concave part of the eye.
2. Thus, it is an incorrect option.

Final answer: The cornea is an external, transparent, and protective proteinaceous covering of the eyeball is the correct statement.