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. **Understanding the Disorders**:
- We need to analyze the options provided: myopia, glaucoma, astigmatism, and hypermetropia.

2. **Identifying the Characteristics of Each Disorder**:
- **Myopia (Nearsightedness)**: This condition occurs when the eyeball is elongated, causing images of distant objects to be focused in front of the retina. It is corrected using concave lenses, not convex.
- **Glaucoma**: This is a condition characterized by damage to the optic nerve, often due to increased intraocular pressure. It is not related to the shape of the eyeball or lens correction.
- **Astigmatism**: This disorder arises from an irregular curvature of the cornea or lens, leading to blurred vision. It does not involve the shortening of the eyeball.
- **Hypermetropia (Farsightedness)**: This condition occurs when the eyeball is shorter than normal in the anteroposterior axis, causing images of nearby objects to be focused behind the retina. It can be corrected with convex lenses.

3. **Conclusion**:
- Based on the analysis, hypermetropia is the disorder caused by the shortening of the eyeball in the anteroposterior axis and can be corrected using convex lenses.

### Final Answer:
The disorder caused due to shortening of the eyeball in the anteroposterior axis and can be corrected using convex lenses is **Hypermetropia**.