Chronic smokers face the risk of diminished eyesight, Fortune reports.
A study in the journal Psychiatry Research found that smokers’ ability to distinguish colors and contrasts is damaged over time, and that over a prolonged period, smokers experience significant changes to their color vision, both red-green and blue-yellow vision systems.
The researchers noted that previous studies showed small but inconclusive evidence that heavy tobacco affected spatial and color vision.
In this new controlled study of non-smokers and chronic cigarette smokers, visual processing impairments were pronounced in the group of tobacco addicts.
“Self-administered consumption of substances containing neurotoxic chemicals may be responsible for an overall color vision loss,” the study authors noted and added that further studies are needed to investigate “reduction on blood flow in the retina, oxidative stress, and even nutrient absorption.”