Differential distribution of some elements in a camera type eye-lens as revealed by energy dispersive x-ray micro-analysis

Differential distribution of some elements have been detected in the cortex and medulla of the camera type eye-lens in a fresh water fish, Notopterus sp., using energy dispersive X-ray spectroscopy. This unique pattern of elemental distribution explains the less understood mechanism by which the optical properties of different parts of the fish lens are altered continuously and differentially during growth. The study also suggests the possible optical roles of some elements in ocular refractive structures.