According to an American study, smoking decreases the ability of smokers to discern colors and shapes. The effects of toxic substances in cigarette smoke on the vascular system could be the cause.
Some dangers of tobacco are still unknown ... Just like its consequences on the sight. Researchers from the American University of Rutgers show that smoking a pack a day gradually reduces the ability to perceive colors and shapes.
The study, the results of which are published in Psychiatry Research, is based on the participation of 134 volunteers: 71 non-smokers and 63 smokers, consuming one pack per day on average. During the search, they had to watch a CRT monitor located at 1,50 meters away from them, which stimulated their vision. Meanwhile, the researchers analyzed their vision. They were particularly interested in their ability to distinguish colors and levels of contrast.
Scientists have found that smokers have more difficulty perceiving contrasts and colors compared to non-smokers. Their perception of the red-green and blue-yellow color axes is also altered. Over time, the toxic products in cigarette smoke could cause a complete loss of color vision in smokers.
According to Steven Silverstein, one of the co-authors, this degradation of vision could be related to the negative effects of tobacco on the vascular system: blood vessels and neurons in the retina would be damaged, causing damage to vision. The other hypothesis is related to the brain: the cigarette is known to damage one of the brain areas responsible for sight. This is not the first time that the links between tobacco and vision disorders are studied: a previous study already noted a doubling of the risk of age-related macular degeneration (AMD) in smokers.
source : Pourquoidocteur.fr/