Alcohol Impairs Night Vision

"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. The deterioration in vision is significantly greater in subjects with breath alcohol content over 0.25mg/litre, the legal limit for driving recommended by the World Health Organization," notes Science Daily. "A study conducted by the University of Granada has demonstrated that alcohol consumption markedly impairs night-vision because it increases the perception of halos -- luminous circles -- and other visual night-time disturbances." Read more.