Which of the following statements is correct?

Options

A. Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye
B. Cornea is an external, transparent and protective proteinacious covering of the eye-ball.
C. Cornea consists of dense connective tissue of elastin and can repair itself.
D. Cornea is convex, transparent layer which is highly vascularised.

Answer

To determine which statement about the cornea is correct, let's analyze each option step by step.

### Step 1: Analyze Option A
**Statement:** "Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye."

- The cornea is indeed made up of a dense matrix of collagen fibers, which provide strength and transparency.
- It is also known to be highly sensitive due to the presence of numerous nerve endings.

**Conclusion:** This statement is correct.

### Step 2: Analyze Option B
**Statement:** "Cornea is an external transparent and protective proteinaceous covering of the eyeball."

- The cornea is transparent and does serve as a protective covering for the eye.
- However, it is not primarily described as "proteinaceous" in common terms; it is more accurately described in terms of its collagen composition.

**Conclusion:** This statement is partially correct but not the best description.

### Step 3: Analyze Option C
**Statement:** "Cornea consists of dense connective tissue of elastin and can repair itself."

- The cornea primarily consists of collagen, not elastin.
- While the cornea does have some capacity for self-repair, the description of its composition is incorrect.

**Conclusion:** This statement is incorrect.

### Step 4: Analyze Option D
**Statement:** "Cornea is convex transparent layer which is highly vascularized."

- The cornea is indeed convex and transparent, but it is avascular (lacks blood vessels).
- Nutrients are supplied via the tear fluid and aqueous humor.

**Conclusion:** This statement is incorrect.

### Final Conclusion
After analyzing all the options, the correct statement is:

**Answer:** Option A - "Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye."

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