origin of the cataract

ORIGINS OF CATARACT. Definition Cataract is an eye disease characterized by the clouding or opacification of the natural lens of the eye found behind the pupil, which focuses the image on to the retina. This results in a decrease in vision as the lens becomes cloudy which can eventually lead to total blindness. *Claude Monet is a pinter who had the cataract, we can see the evolution of his pictures throughout his illness. We note it became more and more abstract. *image du travail de l'oeil For beginning, let's see how the eye works: Eyes are organs that detect light and convert it into electro-chemical impulses in neurons. The simplest photoreceptor cells in conscious vision connect light to movement. In higher organisms the eye is a complex optical system which collects light from the surrounding environment, regulates its intensity through a diaphragm, focuses it through an adjustable assembly of lenses to form an image, converts this image into a set of electrical signals, and transmits these signals to the brain through c...