**Question:** Rapid change of presbyopic glass is a feature of –

A. Myopia
B. Hyperopia
C. Astigmatism
D. Presbyopia

**Core Concept:**
Discussing the concept of presbyopia, which is a common age-related refractive error affecting the eye's ability to focus on near objects. Presbyopia occurs due to the gradual loss of مرونة (elasticity) of the lens in the eye, which is essential for focusing on objects at different distances.

**Why the Correct Answer is Right:**
Presbyopia (option D) is characterized by a gradual loss of flexibility in the lens of the eye, making it difficult to focus on near objects over time. This leads to a rapid change in the refractive power of the lens, causing a need for reading glasses at an earlier age and increased difficulty in focusing on near objects.

**Why Each Wrong Option is Incorrect:**

A. Myopia (option A) is a refractive error where the eye is too long or the cornea is too steep, causing distant objects to appear blurred. The refractive power does not change with age, making it a different condition from presbyopia.

B. Hyperopia (option B) is a refractive error where the eye is too short or the cornea is too flat, causing near objects to appear blurred. Similar to myopia, the refractive power does not change with age, making it unrelated to presbyopia.

C. Astigmatism (option C) is a refractive error resulting from an irregular curvature of the cornea, causing blurred vision at all distances. Astigmatism is distinct from presbyopia as it affects vision at all distances and is not age-related.

**Clinical Pearl:**
Presbyopia is a common phenomenon in the aging population, affecting the ability to focus on near objects and requiring the use of reading glasses. It is essential for students and healthcare professionals to understand the concept of presbyopia for proper diagnosis and patient counseling.

**Correct Answer:** D. Presbyopia

---

---

---

---

---

---