Groups Lead mean (SD) Cadmium mean (SD) Copper mean (SD)   (Lens) µ g/gm. (Lens) µ g/gm (Lens) µ g/gm Groups 1 Smoker (n=75)   2.74 ± 2.12   0.11 ± 0.13   2.04 ± 1.87 Groups 2 Non-Smoker (n=25)   0.65 ± 0.23   0.01 ± 0.00   0.96 ± 0.33

Table 3: Cu, Pb and Cd concentration (mean & SD) in smokers and non-smokers of study participants (ug/gm of tissue weight)