This results in distant objects appearing blurry, while objects near to the viewer can be seen in focus. The result of farsightedness is that objects near to the viewer appear blurry, while objects in the distance are seen more clearly. Most commonly the cornea is curved differently in one area than in another area often shaped more like a football than a basketball. The result of astigmatism is that objects are not focused into a single image and vision is distorted or blurry. It may occur by itself or together with myopia or hyperopia.
Most people have at least a small degree of astigmatism.
Presbyopia results from a change within the eye in which the internal lens loses its ability to focus on close-up objects. It usually becomes apparent to most people in their early forties. Currently, no form of refractive surgery is able to safely and effectively correct presbyopia.