Which of the following physiological change occurs in near vision
**Question:** Which of the following physiological change occurs in near vision
A. Mydriasis
B. Convergence
C. Accommodation
D. Reduced depth perception
**Core Concept:** Near vision is a term used to describe the ability to see objects at a close range, typically within the distance of 25-30 cm from the eye. This process involves the combined action of various physiological changes in the eye.
**Why the Correct Answer is Right:** C. Accommodation is the correct answer because it is the physiological change that occurs in the eye during near vision. Accommodation is the process by which the lens of the eye changes its shape to focus light onto the retina, enabling clear vision at different distances.
**Why Each Wrong Option is Incorrect:**
A. Mydriasis (widening of the pupil) is a reflexive response to low light levels and does not directly contribute to near vision.
B. Convergence (the process of bringing two images from different objects onto the same point on the retina) is involved in farsightedness and occurs during distant vision, not near vision.
D. Reduced depth perception is a consequence of poor accommodation, but it does not describe a physiological change that occurs during near vision.
**Clinical Pearl:** Accommodation is a crucial aspect of visual acuity, and its impairment can lead to presbyopia, a common age-related eye condition that affects near vision. Understanding accommodation is essential for assessing and treating patients with visual problems.