What is presbyopia?

Explanation

**Step-by-Step Solution:**

1. **Definition of Presbyopia**: Presbyopia is an age-related vision condition that affects the eye's ability to focus on nearby objects.

2. **Cause of Presbyopia**: The primary cause of presbyopia is the hardening of the lens inside the eye. As people age, the lens becomes less flexible.

3. **Impact on Vision**: Due to the hardening of the lens, it becomes difficult for the eye to change its shape to focus on close objects, leading to difficulty in reading or seeing things up close.

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