Which of the following is devoid of blood supply?

Options

A. Retina
B. Choroid
C. Cornea
D. Sclerotic.

Answer

To solve the question "Which of the following is devoid of blood supply?", we will analyze each option provided in the context of the eye's anatomy.

### Step-by-Step Solution:

1. **Identify the Options**: The question mentions several parts of the eye: retina, choroid, cornea, and sclera. We need to evaluate each of these to determine which one lacks blood supply.

2. **Evaluate the Retina**:
- The retina is the inner layer of the eye responsible for converting light into neural signals.
- It is supplied with blood by the retinal blood vessels.
- **Conclusion**: The retina is not devoid of blood supply.

3. **Evaluate the Choroid**:
- The choroid is the middle layer of the eye and is rich in blood vessels.
- It provides nutrients and oxygen to the outer layers of the retina.
- **Conclusion**: The choroid is also not devoid of blood supply.

4. **Evaluate the Cornea**:
- The cornea is the transparent front part of the eye that covers the iris and pupil.
- It does not contain blood vessels and instead receives oxygen directly from the air through diffusion.
- **Conclusion**: The cornea is indeed devoid of blood supply.

5. **Evaluate the Sclera**:
- The sclera is the white outer layer of the eye that provides structure and protection.
- It has blood supply from the surrounding tissues.
- **Conclusion**: The sclera is not devoid of blood supply.

6. **Final Answer**: Based on the evaluations, the part of the eye that is devoid of blood supply is the **cornea**.