Question

A person's near point is \(50\text{ cm}\). His far point is \(2\text{ m}\). What is the name of the defect of vision he is suffering from?

Hint:

When both near and far points are abnormal in this manner, the person requires a dual correction strategy.

Answer 1

Step 1: Understanding the Concept:
A normal human eye has a near point of \(25\text{ cm}\) and a far point at infinity.

Step 2: Detailed Explanation:
The person's near point is \(50\text{ cm}\), which is farther away than the normal \(25\text{ cm}\).
This means he cannot see objects closer than \(50\text{ cm}\) clearly, indicating long-sightedness or Hypermetropia.
His far point is \(2\text{ m}\), which is much closer than infinity.
This means he cannot see objects beyond \(2\text{ m}\) clearly, indicating short-sightedness or Myopia.
Since he exhibits symptoms of both, he is suffering from both Hypermetropia and Myopia (often associated with aging, sometimes called Presbyopia when age-related loss of accommodation is the primary cause).

Step 3: Final Answer:
The person is suffering from both Myopia and Hypermetropia.