For the myopic eye, the defect is corrected by

Options

A. Convex lens
B. Concave lens
C. Cylindrical lens
D. Plano convex lens

Answer

To solve the question regarding the correction of myopic eyes, we need to understand the nature of myopia and how it can be corrected using lenses. Let's break down the solution step by step:

### Step-by-Step Solution:

1. **Understanding Myopia**:
- Myopia, also known as nearsightedness, is a condition where distant objects appear blurry while close objects can be seen clearly. This occurs because the eye's lens focuses light rays in front of the retina instead of directly on it.

2. **Identifying the Problem**:
- In a myopic eye, the image of a distant object is formed before it reaches the retina. This results in a blurred image for distant objects.

3. **Normal Eye Function**:
- In a normal eye, light rays from a distant object converge on the retina, allowing for a clear image. The lens of the eye is typically a convex lens, which converges light rays to focus them on the retina.

4. **Need for Correction**:
- Since myopia causes the image to be focused before the retina, we need a way to adjust the focal point so that it falls on the retina.

5. **Using Lenses for Correction**:
- To correct myopia, we need to decrease the converging power of the eye's lens. This can be achieved by using a concave lens.

6. **Function of Concave Lens**:
- A concave lens diverges light rays, which effectively increases the focal length. By placing a concave lens in front of the myopic eye, the diverging rays will allow the image to be focused on the retina, thus correcting the vision.

7. **Conclusion**:
- Therefore, the defect of myopia is corrected by using a **concave lens**.

### Final Answer:
The defect of myopic eye is corrected by using a **concave lens**.

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