What is myopia or nearsightedness? What are the possible reasons of myopia? How is myopia corrected ? Explain with diagrams.

Explanation

### Step-by-Step Solution

**Step 1: Understanding Myopia (Nearsightedness)**
Myopia, commonly known as nearsightedness, is a vision condition where individuals can see nearby objects clearly, but have difficulty seeing objects that are far away. This occurs because the light entering the eye is focused in front of the retina instead of directly on it.

**Step 2: Reasons for Myopia**
There are two primary reasons for myopia:
1. **Thickened Eye Lens**: The eye lens may become too thick, which can happen if the ciliary muscles (which control the shape of the lens) are unable to relax properly. This results in excessive converging power, causing distant images to focus in front of the retina.
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