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Difficulty: MediumPhysiological Effects of Alcohol on Driving Performance

During night driving, a driver who has consumed alcohol is temporarily blinded by the high-beam headlights of an oncoming vehicle. How does alcohol physiologically affect the driver's ability to recover visual function after being exposed to this bright glare?

  1. It lengthens the glare recovery time because alcohol slows pupil constriction and retards the adaptation rate of retinal cells.Answer
  2. B
    It shortens the glare recovery time because alcohol dilates the pupils permanently to allow more light to reach the retina.
  3. C
    It eliminates glare temporary blindness entirely by decreasing sensitivity to bright light sources.
  4. D
    It has no impact on light adaptation since glare recovery relies exclusively on involuntary corneal reflection mechanisms.

Answer

Alcohol lengthens the driver's glare recovery time because it depresses central nervous system control over pupil constriction and retinal light adaptation.
The correct answer correctly identifies that alcohol depresses the central nervous system, slowing down the pupillary reflexes and retinal adaptation necessary to recover clear vision after glare exposure.

Step-by-Step Solution

1
Identify the physiological mechanism responsible for adapting to sudden bright light at night.
Pupillary constriction and chemical adaptation of retinal photoreceptors control vision recovery after exposure to bright glare.
Bright headlights cause temporary blindness until the eye can regulate light intake and reset sensory pigments.
2
Analyze how alcohol alters central nervous system responses relevant to visual adaptation.
Alcohol acts as a depressant, slowing motor responses of the iris muscles and delaying neural processing in the visual cortex.
This depression significantly increases the time required for a driver's eyes to readjust to darkness after being dazzled by oncoming lights.

Key Concept

Impact of alcohol on visual glare recovery time and light adaptation
Estimated Time:1m 0s
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Topics

Physiological Effects of Alcohol on Driving Performance

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