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Difficulty: EasyPhysiological Effects of Alcohol on Driving Performance

A driver who has consumed alcohol attempts to turn across traffic, misjudging the gap before an oncoming car arrives. Which physiological effect of alcohol directly impairs a driver's ability to accurately gauge the distance and position of approaching vehicles?

  1. Impairment of binocular visual coordination and depth perceptionAnswer
  2. B
    Expansion of peripheral vision beyond normal field limits
  3. C
    Acceleration of eye muscle reflex movement and dynamic acuity
  4. D
    Increased sensitivity of retina rod cells to low-light illumination

Answer

Impairment of binocular visual coordination and depth perception directly reduces a driver's ability to judge distances.
Depth perception requires accurate binocular vision and synchronized eye muscle movement. Alcohol depresses the central nervous system, impairing muscle coordination in the eyes and making it difficult to judge how far away another vehicle is or how fast it is approaching.

Step-by-Step Solution

1
Identify the driving task described
The task requires judging the distance and speed of oncoming traffic.
Accurately assessing gap size relies on depth perception.
2
Analyze how alcohol affects eye function
Alcohol depresses central nervous system control over eye muscles, impairing binocular vision.
Both eyes must work in harmony to provide accurate depth and distance perception.

Key Concept

Physiological Effects of Alcohol on Depth Perception and Visual Coordination
Estimated Time:45s
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Topics

Physiological Effects of Alcohol on Driving Performance

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