Eye is a natural optical device by which human could see objects around him. It forms an inverted, real image on a light sensitive surface called retina. It works on the phenomenon of refraction of light through a natural convex lens.
However, Sanjana was unable to see clearly the words written on the black board placed at a distance of approximately 3.5m from her. Her mother discussed the same with the doctor. Doctor explained her about this defect of vision and its correction.
What kind of defect Sanjana is suffering from?

Options

A. Hypermetropia
B. Myopia or short sightedness or near sightedness
C. Presbyopia
D. Difficulty in identifying objects

Answer

To determine the defect Sanjana is suffering from, we can analyze the information provided step by step.

### Step-by-Step Solution:

1. **Understanding the Problem**:
- Sanjana is unable to see clearly the words written on a blackboard that is approximately 3.5 meters away from her. This indicates a vision problem related to distance.

2. **Identifying the Symptoms**:
- The key symptom here is that Sanjana can’t see objects that are far away. This is a crucial detail as it helps narrow down the type of vision defect.

3. **Defining Vision Defects**:
- There are common vision defects such as myopia (short-sightedness) and hyperopia (long-sightedness).
- Myopia is characterized by difficulty in seeing distant objects clearly, while hyperopia is the opposite, where close objects are difficult to see.

4. **Analyzing the Condition**:
- Since Sanjana has trouble seeing the blackboard, which is a distant object, it suggests that she is likely suffering from myopia.

5. **Conclusion**:
- Therefore, the defect that Sanjana is suffering from is called **Myopia**, commonly referred to as **short-sightedness**.

### Final Answer:
Sanjana is suffering from **Myopia** (short-sightedness).

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