A cataract is a dense, cloudy area that forms in the lens of the eye. A cataract begins when proteins in the eye form clumps that prevent the lens from sending clear images to the retina. The retina works by converting the light that comes through the lens into signals. It sends the signals to the optic nerve, which carries them to the brain.
A refractive error, for example, partial blindness (near sightedness), farsightedness (hyperopia), astigmatism or presbyopia, refractive surgery is a strategy for revising or enhancing vision. There are different surgical methods for modifying eye's centering capacity by reshaping the cornea, or clear, round vault at the front of your eye. Different techniques include embedding a focal point inside the eye. The most generally performed kind of refractive surgery is LASIK (laser-aided situ keratomileusis), where a laser is utilized to reshape the cornea. For individuals who are myopic, certain refractive surgery systems will diminish the bend of a cornea that is excessively steep so that the eye's centering power is reduced.