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Difficulty: MediumPhysiological Effects of Alcohol on Driving Performance

Alcohol consumption impairs a driver's dynamic visual acuity—the ability to clearly resolve details on moving objects or roadway surroundings while in motion—at a lower Blood Alcohol Concentration (BAC) threshold than it impairs static visual acuity.

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Answer

True. Dynamic visual acuity deteriorates at lower Blood Alcohol Concentration levels than static visual acuity because tracking moving targets requires complex, real-time oculomotor coordination that is vulnerable to early central nervous system depression.
The statement is true. Dynamic visual acuity relies on precise, continuous eye-movement tracking to maintain focus on moving hazards. Central nervous system depression caused by alcohol impairs this ocular control at low BAC levels, causing dynamic vision to decline well before static visual acuity is noticeably affected.

Step-by-Step Solution

1
Distinguish between static and dynamic visual acuity in driving contexts.
Static visual acuity involves seeing stationary objects (e.g., reading a parked car's license plate while stopped), whereas dynamic visual acuity involves resolving objects in relative motion (e.g., assessing oncoming traffic speed or reading signs while moving).
Understanding the physiological demands of each visual function clarifies why they respond differently to alcohol.
2
Analyze how alcohol depresses central nervous system and oculomotor control.
Alcohol depresses neural signaling, impairing smooth pursuit eye movements and fine ocular muscle tracking needed to keep moving objects focused on the retina.
Complex motor tracking degrades before simpler, static visual recognition tasks.
3
Evaluate the BAC thresholds for visual degradation.
Studies show dynamic visual acuity begins to deteriorate at BACs around 0.03%–0.05%, whereas static visual acuity is typically maintained until higher BAC levels.
This confirms the statement that dynamic visual acuity is impaired at lower BAC thresholds.

Key Concept

Impact of Alcohol on Dynamic Visual Acuity vs. Static Visual Acuity
Estimated Time:1m 0s
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Topics

Physiological Effects of Alcohol on Driving Performance

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