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Common theory questions

At what blood alcohol level do most people's vision and coordination begin to deteriorate?

Most people's vision and coordination begin to deteriorate at 0,4-1,0 ‰ blood alcohol level.

However, the manner and extent we are affected by alcohol varies from person to person. Factors such as body weight, what and how much you have eaten, your health, how much you have slept and how much water you have been drinking all affect blood alcohol levels.

Your blood alcohol level may also vary greatly between different occasions, even if you have consumed exactly the same amount and type of alcohol.

Medication can enhance the effects of alcohol, meaning that combining alcohol with certain medications, such as sedatives or tranquillisers, can greatly impair your driving ability or even be fatal.

Alcohol affects us in the following way:

  • 0.1-0.4 ‰ – Less inhibitions, overconfidence, and longer reaction time.
  • 0.4-1.0 ‰ – Impaired vision and coordination.
  • 1.0-2.0 ‰ – Double vision, clumsiness and balance problems.
  • 2.0-3.5 ‰ – Fall into deep sleep.
  • 3.5-5.0 ‰ – Go into a coma or die.

The per mille numbers above refer to blood alcohol concentration.