A detailed study is described which involves the employment of neutron activation analysis for the concentration of Br, Cd, Cl, Co, Cu, Fe, Ir, K, La, Mg, Mn, Mo, Na, Sb, Se and Zn in combined lens capsule and epithelium, cortex and nucleus. This study represents the first attempt in evaluating 17 elements at their concentration levels in lens tissue fractions at different age levels. Normal human lenses ranged in age groups from 0 – 5, 10 – 20, 50 – 60, 70 – 85 years. For cataractous lenses, age groups 40 – 55, 60 – 75 and 80 years and over were studied. Essential elements were found to decrease with age, and cataractogenesis. Suspected elements of biological function gave variable results, whereas nonessential elements increased with age and in cataractogenesis.