BBC: 'Beer goggles' effect explained
Scientists believe they have worked out a formula to calculate how "beer goggles" affect a drinker's vision.
Researchers at Manchester University say while beauty is in the eye of the beer-holder, the amount of alcohol consumed is not the only factor.
Additional factors include the level of light in the pub or club, the drinker's own eyesight and the room's smokiness. The distance between two people is also a factor.
Nathan Efron, Professor of Clinical Optometry at the University of Manchester, said: "For example, someone with normal vision, who has consumed five pints of beer and views a person 1.5 metres away in a fairly smoky and poorly lit room, will score 55, which means they would suffer from a moderate beer goggle effect."
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