Nowadays cornea transplantation has been done on large scale because:

Options

A. Easily availbale
B. Without blood supply
C. Easily preserved
D. Easily stiched.

Answer

### Step-by-Step Solution:

1. **Understanding Cornea Transplantation**:
- Cornea transplantation is a surgical procedure where a damaged or diseased cornea is replaced with a healthy one from a donor.

2. **Characteristics of the Cornea**:
- The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. It is crucial for focusing vision.

3. **Lack of Blood Vessels**:
- One of the key features of the cornea is that it does not contain blood vessels. This is significant because blood vessels can trigger the immune response.

4. **Immune Response and Graft Rejection**:
- The absence of blood vessels means that the body’s immune system is less likely to recognize the transplanted cornea as a foreign object. This reduces the chances of rejection.

5. **Conclusion**:
- Therefore, the primary reason cornea transplantation is successful on a large scale is due to the lack of blood supply in the cornea, which minimizes the risk of immune rejection.

6. **Correct Answer**:
- The correct option for the question is **B: without blood supply**.