Squinting and eye discomfort or irritation.Distortion or blurring of images at all distances.Astigmatism is not caused or made worse by reading in poor light, sitting too close to the television or squinting. When your eye is in a relaxed state, light focuses behind the back of your eye, making nearby objects blurry.Īstigmatism may be present from birth, or it may develop after an eye injury, disease or surgery. The effect is the opposite of nearsightedness. Farsightedness (hyperopia) - This occurs when your cornea has too little curvature or your eye is shorter than normal.Instead of focusing precisely on your retina, light focuses in front of your retina, resulting in a blurry appearance of distant objects. Nearsightedness (myopia) - This occurs when your cornea has too much curvature or your eye is longer than normal.Either type of astigmatism can cause blurred vision and blurred vision can occur in one or more direction, (horizontally, vertically or diagonally).Īstigmatism may occur in combination with other refractive errors as well, such as: When your lens is misshapen, it is a lenticular astigmatism. When your cornea is misshapen, it is a corneal astigmatism. In astigmatism, your cornea or lens curves more steeply in one direction or another. Astigmatism is a type of refractive error. However, if your cornea or lens is not uniform and smoothly curved, light rays focus unevenly and create a refractive error. In an ideally shaped eye, each of these focusing elements has a perfectly smooth curvature, like the surface of a smooth ball.Ī cornea or lens with the proper curvature, bends (or refracts) incoming light in the same way, creating sharply focused images on the your retina. Your eye has two anatomical structures that focus images: the cornea and the lens. However, larger amounts cause distorted or blurred vision, eye discomfort, and headaches. Slight amounts of astigmatism usually do not affect vision and do not require treatment. Most people have some degree of astigmatism. This results in blurry vision at any distance.Īstigmatism is a very common vision condition. An irregular shaped cornea or lens prevents light from focusing properly on the retina (the light sensitive surface at the back of the eye). Astigmatism Causes, Symptoms, and Treatment OptionsĪstigmatism is a vision condition that causes blurred vision due to an irregular shape of the cornea (the clear front cover of the eye) or by a curvature of the lens inside the eye.
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