What is nearsightedness and astigmatism?
In a normal eye, the front portion of eye (cornea) and the lens of the eye focus light to form an image on the back surface of the eye, known as the retina. Nearsightedness (myopia) occurs when the eye is too long in relation to the curvature of the cornea. With myopia, light rays entering the eye do not come to a sharp focus precisely on the retina. Instead, they focus further in front of the retina, producing a blurred image. The term “nearsighted” means that you can see near objects more clearly than objects further in the distance. Astigmatism occurs when your cornea is shaped more like a football than a basketball. Because of the oval shape of the cornea, light is focused at more than one place inside the eye. Vision correction can reduce or eliminate both myopia and astigmatism.
