Bi-focal lens are required to correct

Options

A. cataract
B. astigmatism
C. myopia
D. presbyopia

Answer

**Step-by-Step Solution:**

1. **Understanding the Term "Bifocal Lens":**
- Bifocal lenses are designed to have two different focal lengths. This means that they can help correct vision for two types of sight issues.

2. **Identifying the Types of Lenses:**
- Bifocal lenses typically consist of two parts:
- The upper part is usually a concave lens, which helps with distance vision.
- The lower part is a convex lens, which assists with near vision.

3. **Understanding the Need for Bifocal Lenses:**
- As people age, they may experience difficulty seeing both near and far. This condition is known as presbyopia, where the eye's lens loses its flexibility and ability to focus on close objects.

4. **Conclusion:**
- Therefore, bifocal lenses are required to correct presbyopia, allowing individuals to see clearly at both near and far distances.

**Final Answer:**
Bifocal lenses are required to correct presbyopia.

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