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Astigmatism is a common and treatable eye condition which causes irregular focus. Usually, the front surface of an eye is rounded like a football but in an eye with astigmatism, this is shaped like an oval rugby ball. This changes the path of light into the eye, so that the image formed at the back of the eye is not sharply focused.
Astigmatism causes blurry or distorted vision at all distances. Astigmatism is an optical term (not a disease or eye condition) that describes light focussed to different points within the eye depending on the curvature of the cornea (and less so, the lens). If the cornea is round, it will focus light to the same point whichever meridian light ...
Most astigmatism is regular corneal, which gives the front surface of the eye an irregularly curvy shape, like that of a spoon. Eye injuries that result in scars on the cornea can cause an irregular defect. Certain eye surgeries or a disease called keratoconus (gradual thinning of the cornea) can also cause a rare defect.
Corneal astigmatism is usually congenital. Due to this irregular shape of cornea, light rays entering the eye are not focused properly, creating a blurred image.It could be present by birth. Risk ...
Apr 2, 2019 · Most astigmatism is regular corneal astigmatism, which gives the front surface of the eye an oval shape. Irregular astigmatism can result from an eye injury that has caused scarring on the cornea, from certain types of eye surgery or from keratoconus , a disease that causes a gradual thinning of the cornea.
Astigmatism Symptoms. The main symptom of astigmatism is blurred vision. This blurriness can lead to squinting, headaches, and even lightheadedness. Most people notice that the blurriness is worse at night. Struggling with nighttime driving is the main reason people seek out treatment.
What Causes Astigmatism. The precise cause of astigmatism is unknown, but genetics are thought to play a role. Some children are born with it, others will develop it later in life. Eye injuries and surgeries are other factors that may contribute to its development. In still others, a condition known as keratoconus causes astigmatism.
