Research At Granada Finds That The Eye’s Optical Quality Deteriorates After Alcohol Consumption | Science Codex

In a recently-published article in the international Journal of Ophthalmology, the authors evaluate retina-image quality and night-vision performance following alcohol consumption in a sample of 67 subjects. These volunteers had their breath alcohol content measured with an evidential breath-alcohol analyser, supplied by the traffic division of the Spanish Civil Guard in Granada. The participants consumed different quantities of a prize-winning wine from the Pago de Almaraes wineries, S.L. Benalua de Guadix, Granada, winner of the International Challenge du Vin de Bordeaux. “Halometer” measurements This is a night-time image seen with halos.
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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. Credit: Image courtesy of University of Granada [Click to enlarge image] 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 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. Moreover, this deterioration of vision is significantly greater in subjects with breath alcohol content in excess of 0.25mg/litre — the legal limit for driving in Spain and other countries and, also, that recommended by the World Health Organization (WHO). Researchers from the Laboratory of Vision Sciences and Applications conclude that alcohol deteriorates the optical quality of the image we see because, among other things, it disturbs the tear-film that covers the surface of the eye. Essentially, this is because ethanol from alcoholic drinks passes into the tear and disturbs the outermost layer of the tear-film — the lipid layer — facilitating the evaporation of the aqueous part of the tear.
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Eye’s optical quality deteriorates after alcohol consumption — ScienceDaily

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