The deterioration in vision is significantly greater in subjects with breath alcohol content over 0.25mg/liter, the legal limit for driving recommended by the World Health Organization.
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Ethanol in the tear-film is one of the causes: it covers the surface of the eye, disturbs the outer layer and favours evaporation of the aqueous content of the tear, deteriorating the optical quality of the image we see.
They saw either a photo of a person sober next to a photo of the person taken after one drink, or a sober photo next to a photo taken after two drinks.
It turned out that the photos taken after one drink were rated as more attractive than the sober photos, the researchers found. After two drinks, the participants found the sober photo more attractive than the high-alcohol headshot.
The participants were asked to make a neutral facial expression for each photo.
[7 Ways Alcohol Affects Your Health] A separate group of heterosexual students then rated how attractive they found each headshot in side-by-side comparisons.
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This is more marked in subjects with a breath alcohol content level over the legal limit for driving, that is, in excess of 0.25mg/l.