Cataracts are generally defined as breakdown of the lens microarchitecture. Normally in vision, light passes through the lens of the eye so that the image can be projected clearly on the retina. This image is then interpreted as a neural signal. If the lens is unclear, which is a condition called a cataract, the image projected on the retina will be cloudy or blurred. With a cataract, some even, perhaps a DNA mutation, causes opacity of the crystalline lens. It may be there isa structure change accompanied by changs inin lens protein constituents. The opacity or cloudiness means that the refractive index of the lens varies significantly over distances approximating the wavelength of the transmitted light.
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