Figure 2
From: Effects of smoking and smoking abstinence on spatial vision in chronic heavy smokers
Contrast sensitivity bars as a function of age groups for non-smokers, smokers and deprived smokers at each spatial frequency. Color bars represents the sensitivity (reciprocal of contrast threshold) for each spatial frequency. Error bars represents the standard deviation (SD) of the mean sensitivity. ***p < 0.001, **p < 0.01, *p < 0.05.
