Which of the following disorders is caused due to shortening of eyeball in anteroposterior axis and can be corrected using convex lens?

Options

A. Myopia
B. Glaucoma
C. Astigmatism
D. Hypermetropia

Answer

To solve the question regarding which disorder is caused by the shortening of the eyeball in the anteroposterior axis and can be corrected using a convex lens, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of the Eye**:
- The human eye has a specific shape that allows it to focus light correctly on the retina. The anteroposterior axis refers to the distance from the front (cornea) to the back (retina) of the eye.

2. **Identify the Disorder**:
- A shortening of the eyeball in the anteroposterior axis typically leads to difficulty in focusing on nearby objects. This condition is known as **hypermetropia** or **farsightedness**. In hypermetropia, the light rays entering the eye focus behind the retina.

3. **Explain the Correction Method**:
- Hypermetropia can be corrected using a **convex lens**. A convex lens converges light rays before they enter the eye, allowing the image to be focused correctly on the retina rather than behind it.

4. **Conclusion**:
- Therefore, the disorder caused by the shortening of the eyeball in the anteroposterior axis that can be corrected using a convex lens is **hypermetropia**.

### Final Answer:
The disorder is **hypermetropia**.