Alcohol directly affects the brain's ability to control eye movement. Which statements about eye movement are true?

• A. As the alcohol concentration level increases, eye movement to the side decreases
• B. Higher alcohol concentration levels, a driver tends to look straight ahead
• C. Both A and B
• D. Eye movement is unaffected by alcohol

Answer: (C)

Alcohol slows the brain’s control of the eye muscles that you use to scan the road. When more alcohol is in the system, the ability to move eyes from side to side diminishes, so your horizontal gaze is reduced. At higher levels, drivers tend to look straight ahead rather than actively scanning the sides because the signals that drive those quick, outward eye movements are weakened. This combination means peripheral hazards are easier to miss, while the forward gaze becomes more dominant. So both ideas describe the same impairment: reduced side-to-side eye movement with higher alcohol levels and a forward, fixed gaze at higher concentrations, which is why they’re both true.