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 external, transparent and protective proteinaceous 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

Explanation

To determine which statement about the cornea is correct, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement Analysis**:
- **Statement 1**: "Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye."
- This statement is correct. The cornea does have a dense matrix of collagen fibers and is known to be the most sensitive part of the eye due to the high density of nerve endings.

2. **Statement 2**: "Cornea is external transparent and protective proteinaceous covering of eye bowl."
- This statement is partially correct. While the cornea is indeed external and transparent, it is not proteinaceous in nature. Therefore, this statement is incorrect.

3. **Statement 3**: "Cornea consists of dense connective tissue of elastin, and can repair itself."
- This statement is incorrect because the cornea is primarily made up of collagen, not elastin. While it is true that the cornea can repair itself after minor injuries, the incorrect part about elastin makes the entire statement false.

4. **Statement 4**: "Cornea is convex transparent layer which is highly vascularized."
- This statement is incorrect. The cornea is a convex transparent layer, but it is not vascularized; it lacks blood vessels.

### Conclusion:
After analyzing all the statements, the only correct statement is the first one: "Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye."