Which of the following statements is correct ?

Options

A. Cornea is convex, transparent layer which is highly vascularised
B. Cornea consists of dense metrix of collegen and is the most sensetive portion of the eye.
C. Cornea is an external, transparent and protective proteinacious covering of the eye- ball
D. Cornea consists of dense connective tis- sue of elastin and can repair itself.

Answer

To solve the question regarding which statement about the cornea is correct, we can analyze each option step by step:

### Step 1: Evaluate the First Statement
- **Statement**: "Cornea is a convex transparent layer which is highly vascularized."
- **Analysis**: The cornea is indeed a transparent layer, but it is **not** vascularized; it is avascular (lacks blood vessels). Therefore, this statement is **incorrect**.

### Step 2: Evaluate the Second Statement
- **Statement**: "Cornea consists of the dense matrix of collagen and is the most sensitive portion of the eye."
- **Analysis**: While the cornea does contain collagen, it is not accurate to say it consists of a dense matrix of collagen in the way described, and the statement about sensitivity is misleading. The cornea is sensitive, but the phrasing makes this statement **incorrect**.

### Step 3: Evaluate the Third Statement
- **Statement**: "Cornea is external, transparent, protective, proteinaceous covering of the eyeball."
- **Analysis**: This statement accurately describes the cornea. It is indeed an external, transparent, and protective covering of the eyeball. Therefore, this statement is **correct**.

### Step 4: Evaluate the Fourth Statement
- **Statement**: "Cornea consists of the dense connective tissue of elastin and can repair itself."
- **Analysis**: The cornea is primarily made up of collagen, not elastin. While it has some ability to repair itself, the description is misleading. Thus, this statement is **incorrect**.

### Conclusion
After evaluating all the statements, the correct answer is the **third statement**, which accurately describes the cornea.