A person is suffering from the defect astigmatism. Its main reason is

Options

A. cannot see any object
B. cannot see any object in two perpendicular directions simuletaeously
C. cannot see near by objects
D. cannot see distant objects

Explanation

### Step-by-Step Solution:

1. **Understanding Astigmatism**:
- Astigmatism is a common refractive error in the eye caused by an irregular shape of the cornea or lens. Unlike a normal eye, where the cornea is uniformly curved, in astigmatism, the curvature is uneven.

2. **Effect of Irregular Curvature**:
- Due to the irregular curvature of the cornea, light rays entering the eye do not focus evenly on the retina. This leads to distorted or blurred vision at various distances.

3. **Symptoms of Astigmatism**:
- A person with astigmatism may have difficulty seeing objects clearly in two perpendicular directions simultaneously. This means that they might see one direction clearly while the other appears blurred.

4. **Conclusion**:
- The main reason for astigmatism is that the cornea is not uniformly curved, which prevents the eye from focusing light properly. This results in the inability to see objects clearly in two perpendicular directions at the same time.

5. **Final Answer**:
- The main reason for astigmatism is that the person cannot see any object in two perpendicular directions simultaneously.