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Difficulty: MediumPhysiological Effects of Alcohol on Driving Performance

A driver who has consumed alcohol struggles to accurately judge the distance to an approaching vehicle when attempting to make a left turn at an intersection. Which physiological impairment caused by alcohol is directly responsible for this specific difficulty?

  1. Impairment of eye muscle coordination and depth perceptionAnswer
  2. B
    Immediate permanent damage to the optic nerve preventing light absorption
  3. C
    Inability to distinguish between red and green traffic light signals
  4. D
    An involuntary increase in peripheral vision that creates double vision

Answer

Impairment of eye muscle coordination and depth perception
Alcohol acts as a central nervous system depressant that slows eye muscle reflexes and impairs binocular vision. This reduces depth perception, making it difficult for drivers to judge distances and relative speeds of oncoming traffic.

Step-by-Step Solution

1
Identify the driver's specific operational difficulty described in the scenario
The driver cannot accurately estimate distance or spatial separation from an oncoming vehicle.
Judging distances requires precise binocular vision and eye muscle synchronization.
2
Analyze how alcohol affects visual acuity and ocular control
Alcohol depresses the central nervous system, slowing down eye muscle movement and impairing depth perception.
Proper depth perception relies on both eyes working in tandem, which is compromised as blood alcohol concentration rises.

Key Concept

Physiological Effects of Alcohol on Vision and Depth Perception
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Topics

Physiological Effects of Alcohol on Driving Performance

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