Contrary to the hypothesis, tobacco smokers had a very small but significant improvement in left eye pursuit but no change in pupil diameter. Effects of tobacco smoking on the human pupil. Determine the effects of tobacco cigarette or sham placebo-smoking on pupil diameter. Shortly after smoking one tobacco cigarette, pupillary constriction was greater than after sham-smoking. The effects of nicotine on spatial and non-spatial expectancies in a covert orienting task.
Colour vision disturbances in chronic smokers.
The aim of the present study was to test the influence of smoking on colour perception. Otherwise healthy smokers with a cigarette consumption of less than 20 cigarettes per day do not show any disturbances in colour vision. Smokers who consume more than 20 cigarettes per day may suffer colour vision defects as a result.