Identify the correct statement

Options

A. Cornea is devoid of blood vessels
B. Choroid layer is made up of collagenous material
C. Macula lutea is highly vascularised and contains melanin
D. The diameter of the pupil remains unaltered if a strong beam of light is focussed on the eye

Answer

To solve the question "Identify the correct statement," we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Evaluate the First Statement: "Cornea is devoid of blood vessels."**
- The cornea is indeed an avascular structure, meaning it does not contain blood vessels. It receives nutrients from the tear fluid and the aqueous humor. Therefore, this statement is **correct**.

2. **Evaluate the Second Statement: "Choroid layer is made up of collagenous material."**
- The choroid is a layer of the eye that is primarily composed of blood vessels and connective tissue, but it is not primarily made of collagenous material. The choroid consists of three layers: choriocapillaries, stroma, and lamina fusca. Therefore, this statement is **incorrect**.

3. **Evaluate the Third Statement: "Macula Lutea is highly vascularized and contains melanin."**
- The macula lutea is a small area on the retina that is responsible for high-acuity vision. It is not highly vascularized; rather, it is a region with a high concentration of photoreceptor cells (cones) and does not contain melanin. Therefore, this statement is also **incorrect**.

4. **Evaluate the Fourth Statement: "The diameter of the pupil remains altered if a strong beam of light is focused on the eye."**
- The pupil does respond to light; it constricts (reduces in diameter) when exposed to bright light to protect the retina and improve visual acuity. Therefore, the statement is **correct** in its implication that the diameter of the pupil changes in response to light.

### Conclusion:
Based on the evaluations:
- The first statement is **correct**.
- The second and third statements are **incorrect**.
- The fourth statement is **correct** but not the best option as it implies a continuous alteration rather than a response.

The correct answer is the first statement: "Cornea is devoid of blood vessels."