## Core Concept
Accommodation in the eye refers to the process by which the eye changes optical power to maintain a clear image or focus on an object as its distance varies. This is primarily achieved through changes in the shape of the lens.

## Why the Correct Answer is Right
The correct answer, , involves the **contraction of the ciliary muscles**. When viewing near objects, the ciliary muscles contract, which releases tension on the zonular fibers (or suspensory ligaments) attached to the lens. This allows the lens to become more spherical due to its elastic nature, increasing its refractive power and enabling near vision. This process is crucial for the eye's ability to focus on objects at varying distances.

## Why Each Wrong Option is Incorrect
* **Option A:** - This option is incorrect because the **relaxation of the ciliary muscles** actually occurs when focusing on distant objects, not during accommodation for near vision.
* **Option B:** - This option is incorrect as it suggests **involvement of the extraocular muscles**, which are responsible for eye movements (e.g., lateral rectus, medial rectus), not for the process of accommodation.
* **Option C:** - This option is incorrect because **pupil constriction**, while it can occur in conjunction with accommodation (as part of the near reflex), is not the mechanism by which accommodation occurs.

## Clinical Pearl / High-Yield Fact
A key clinical correlation is the **near reflex**, which consists of three components: accommodation (increase in lens curvature), convergence (inward movement of the eyes), and miosis (pupil constriction). This reflex is essential for focusing on near objects and is often affected in various neurological and ophthalmological conditions.

## Correct Answer Line
**Correct Answer: . Contraction of ciliary muscles.**