Cataract is an eye condition with cloudiness (opacity) of the eye lens that affects vision by obstructing the passage of light.
Cataracts are closely relating with the normal aging process; at an age of 80, more than half of them are effects by the cataract problem.
Eye lens – is the transparent structure behind the iris that helps to focus light rays onto the retina.
At an early stage of cataract, lens power may be increased causing myopia and slowly yellowing (opacity) of the lens causes low vision clarity. Cataract normally progresses slowly to cause vision loss or even blindness if untreated. Cataract is responsible for 48% of the world total population with blindness. Cataract usually develops in both eyes, but typically one eye progress earlier than the other does.
Eye lenses are made of water, proteins, and polysaccharides. They are arranging so precisely in a way that makes a clear lens, which allows light to pass through it and produce a clear image in the retina. Normal aging makes some of the proteins to clump together, and the area of the lens becomes cloudy. Over time the eye lens changes from transparent to cloudy yellowish brown, makes it harder to see.