Fig. 23. A comparison of the sagittal width of the various regions of the lens as a function of age. Note that the overall increase in the diameter of the whole lens is due primarily to an increase in the thickness of the cortex, whereas the nuclear region undergoes very little change. (Brown NAP: Lens change with age and cataract; slit-image photography. Ciba Foundation Symposium 19, The Human Lens in Relation to Cataract. New York, Associated Scientific, 1973)