COMMON VISION PROBLEMS:

Human eye's working is similar to that of a camera. It focuses light rays onto a film called retina. Light entering into it first passes thorugh a lens termed as cornea, ehich serves to focus the light. Located behind the coenea is another lens, known as the crystalline lens. Further focusing of light on the film called 'retina', at the back of the eye, in order to produce a clear image is done thorugh this crystalline lens. Finally, the information is transmitted to the brain thorugh optic nerve. Without the cornea and the crytalline lens the eye simply cannot focus the light precisely onto the retina.