Along with nearsightedness and farsightedness, astigmatism is a “refractive error” that results from a misshapen cornea, the clear front covering of the eye. Normally, the cornea has a smooth, round curvature. In astigmatism, the curve is elongated and greater in one direction than in another. In simple terms, the astigmatic eye is shaped more like a football than a basketball. Thus, when light passes through the cornea, it is not refracted equally in all directions. Instead, incoming images are focused on several points on the retina to create blurred and distorted vision for both nearby and faraway objects. While slight amounts of astigmatism do not affect vision, cases that impair vision can be easily corrected with prescription lenses. To ensure good vision, you need lenses prescribed for your specific vision problem and frames that fit properly on your face. March is Save Your Vision Month. Most people have some degree of astigmatism, which may worsen or decrease over time.
Apr 05, 2013