**Question:** Maximum field of vision:

A. 200 degrees
B. 180 degrees
C. 140 degrees
D. 160 degrees

**Core Concept:**
Maximum field of vision refers to the range of angles that the visual system can detect visual stimuli. It is important for understanding visual perception and the human eye's capacity to capture visual information.

**Why the Correct Answer is Right:**
Maximum field of vision occurs when the eyes are in a neutral position, with neither eye turning inward (esotropia) nor outward (exotropia). In this position, both eyes can cover a wider area, enabling the brain to process more visual information. The correct answer (D) represents the maximum field of vision, which is achieved when the eyes are in a neutral position.

**Why Each Wrong Option is Incorrect:**
Option A is too narrow, indicating a limited field of vision when the eyes are not in their neutral position.
Option B is also too narrow, suggesting a field of vision reduced by the presence of eye misalignment.
Option C is also too narrow, showing a field of vision limited by eye misalignment or other factors.

**Clinical Pearl:**
Ensuring proper alignment of the eyes (orthoptics) is crucial for optimal visual acuity and a wide field of vision. Vision problems, such as strabismus, can significantly impair a person's ability to see clearly and observe their surroundings.

**Correct Answer:** D. 160 degrees

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Maximum field of vision, also known as orthoptic acuity, refers to the range of angles that the eyes can cover to provide the brain with a comprehensive view of the environment. In a healthy individual, the eyes are in their neutral position, allowing for the widest field of vision. The field of vision is crucial for everyday activities and can be affected by various ocular and neurological disorders. A wide field of vision enables a person to have a better appreciation of their surroundings and navigate their environment safely.