To solve the problem, we need to identify the defect that causes people to have difficulty seeing near objects clearly, but allows them to see distant objects clearly.
1. Understanding the Defects:
- Myopia (or nearsightedness) is a condition where people can see near objects clearly, but distant objects appear blurred. This is the opposite of the given condition.
- Cataract is a condition where the eye's lens becomes cloudy, affecting vision at all distances.
- Presbyopia is a condition associated with aging, where the ability to focus on near objects decreases, but distant vision may remain clear.
- Hypermetropia (or farsightedness) is the defect where people can see distant objects clearly, but near objects appear blurred. This matches the condition described in the question.
Final Answer:
The defect described is called Hypermetropia (Option D).