Definition

A cataract occurs when the natural lens of the eye gets cloudy. At first, it gets kind of yellow in color or brown in color, but it can actually become milky white. If you think of the human eye like a traditional camera, the cataract occurs in the lens, so a the light is passing from the object of regard through the lens and ultimately onto the retina (which is similar to the film in a camera) – the image quality is poor if the lens is cloudy.