Techniques of dynamic light scattering have been applied to biological lens material in recent years by a number of authors. The enhanced scattering due to cataract, leading to eventual opacity, has been described by two related models - one ascribing the phenomenon to aggregations of the globular crystallins and the other to a phase separation. Our own observations of Brillouin scattering, and correlation studies of diluted material, indicate some degree of simple aggregation. However, work on natural and homogenised material (including human, bovine and fish lenses) shows very slow fluctuations which suggest more complex interactions.
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