A new study has found that the eye's optical quality deteriorates after alcohol consumption. Not just how the images are interpreted, the way some unemployed guy who is 'getting his band together' looks more attractive at 2 AM after a few shots of Jägermeister, but the physical eye itself.
The authors say ethanol in the tear-film is one of the causes: it covers the surface of the eye, disturbs the outer layer and favors 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 the legal limit for driving, which is another obvious reason to call Uber and not drive yourself.
The study finds 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/liter - one glass of wine or beer in the last hour.
Researchers from the Laboratory of Vision Sciences and Applications conclude that alcohol deteriorates the optical quality of the image 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. In an eye with a deteriorated tear-film, the quality of the image that forms in the retina also deteriorates, as the study shows.
In their Journal of Ophthalmology article, 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 analyzer, 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. Benalúa de Guadix, Granada, winner of the International Challenge du Vin de Bordeaux.
Credit: Universidad de Granada
To assess visual performance in low-illumination conditions, the researchers used a visual test known as a “halometer”, developed in the laboratory. This enabled them to quantify the level of night-vision disturbance in the form of, say, halos around bright lights, perceived by the subjects.
The results showed that following alcohol consumption, the perception of halos and other night-time visual disturbances increases and the optical quality of the image the eye produces deteriorates. 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.
Principal author of the study José Juan Castro explains that “this research offers results of value to society and public healthcare, especially in relation to night-time driving. Alcohol consumption and low-illumination conditions are factors present in many traffic accidents, hence people must to be made aware of the effects of alcohol consumption, especially on vision”.
In fact, under these conditions, the perception of visual halos can make it difficult for drivers to see a pedestrian crossing the road, to distinguish a traffic sign, or they could be dazzled in some way by the headlights of another car coming towards them.
Citation: José J. Castro, Antonio M. Pozo, Manuel Rubiño, Rosario G. Anera and Luis Jiménez del Barco, 'Retinal-Image Quality and Night-Vision Performance after Alcohol Consumption', Journal of Ophthalmology Volume 2014, Article ID 704823, 7 pages DOI: 10.1155/2014/704823
- PHYSICAL SCIENCES
- EARTH SCIENCES
- LIFE SCIENCES
- SOCIAL SCIENCES
Subscribe to the newsletter
Stay in touch with the scientific world!
Know Science And Want To Write?
- Giddings: The 750 GeV Diphoton Resonance Is A Graviton
- Why Your Muscles Get Less Sore As You Stick With Your Gym Routine
- Inconvenient Truth: There Are Synthetic Pesticide Residues On Organic
- No Higgs Needed: 5 Ways Particle Accelerators Have Changed The World
- Starting Age Of Marijuana Use May Have Long-term Effects On Brain Development
- A.I. May Tell Us What's Going To Be Big In Science This Year
- Future Transatlantic Flight Delays Blamed On Global Warming
- "It may... Or it may not! THAT'S SCIENCE!!! ..."
- "(sarc on) Nice try! (sarc off) Typical reply from an uninformed ditto-head alarmist, that is, to..."
- " Not sure what point you are trying to make, but... No, most of the energy emitted from the Earth..."
- "Wow, a blog by a weatherman, that’s convincing. A total Gish gallop of inaccurate observations..."
- "Where can I buy a mug like the one above??..."
- National Academy of Medicine Supports Replacing Faulty Mitochondrial DNA
- Pregnant & Still Smoking: Better Way Needed To Quit
- ‘Healthy Obesity’ May Be an Oxymoron, Study Says
- Keeping the PBJ, While Chasing NBA Immortality
- The Public Toilet Seat’s Place on the ‘Ick Scale’
- Moms-to-Be: Take Chocolate Benefits With Grain of Salt
- New alcohol guidelines unlikely to have a direct impact on drinking
- Reverse US funding freeze on research into gun violence, say experts
- Should PCORI fund more primary care research?
- Lower oxygen saturation levels increase risk of death in extremely preterm infants -- NEJM
- New study reveals incidence of dementia may be declining