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Difficulty: MediumPhysiological Effects of Alcohol on Driving Performance

Alcohol consumption impairs visual accommodation, slowing the rate at which a driver's eyes can shift focus between close objects, such as the vehicle's dashboard instruments, and distant road hazards.

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Answer

True. Alcohol slows the muscular responsiveness of the eyes, causing a delayed refocusing effort when shifting gaze between the dashboard instruments and distant traffic.
The statement is true because alcohol acts as a central nervous system depressant, impairing fine motor control and delaying the contraction and relaxation of the ciliary muscles that change the eye's focal length.

Step-by-Step Solution

1
Identify the specific physiological mechanism described in the statement
The mechanism is visual accommodation, which is controlled by the ciliary muscles in the eye to adjust focal length between near and far objects.
Accurate physiological evaluation requires isolating the specific ocular motor function being tested.
2
Analyze how alcohol consumption affects ocular muscular control
As a central nervous system depressant, alcohol reduces nerve impulse transmission speeds, weakening fine muscle coordination and lengthening the time required for ciliary muscles to adjust lens curvature.
Understanding depressant effects on motor pathways explains why visual focal adjustments become sluggish.
3
Relate the physiological impairment to real-world driving scenarios
When an impaired driver looks down at the speedometer and then back up at the road ahead, their vision remains transiently blurry, creating dangerous blind intervals at speed.
Connecting ocular motor lag to practical driving tasks confirms the truth of the statement.

Key Concept

Impact of Alcohol on Visual Accommodation
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Topics

Physiological Effects of Alcohol on Driving Performance

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