Heavy smoking, a study published in Psychiatry Research has warned, is associated with damaged vision.
Thiago P. Fernandes, Ph.D., from the Neuroscience and Behavior Laboratory in Joao Pessoa, Brazil, and colleagues assessed the impact of chronic smoking on spatial and colour vision among 71 healthy controls and 63 individuals with tobacco addiction (smoked >20 cigarettes a day; mean age, 34.7 years) who were matched for age, gender, and level of education. Contrast sensitivity for linear sine-wave gratings and colour discrimination (using the Ellipse and Trivector subtests) were used to assess visual processing.
The researchers found that heavy smokers had reduced sensitivity for all spatial frequencies and impairments in colour discrimination for both Trivector and Ellipse.
“These results,” the authors concluded, “indicate that excessive use of cigarettes, or chronic exposure to their compounds, affects visual discrimination, supporting the existence of overall deficits in visual processing in tobacco addiction.”
REFERENCE: Fernandes et al: Visual impairments in tobacco use disorder; https://www.sciencedirect.com/science/article/pii/S016517811832078X