In addition to blurry vision, symptoms of astigmatism include eye strain and headaches. Axis is measured in degrees of an arc, like the curve of your eye, from 0 to 180. It is measured in diopters.Īxis: Locates the position of the irregularity on the cornea or the lens. The higher the number, the stronger your prescription.Ĭylinder: This is the severity of astigmatism or how irregular the cornea or lens is shaped. A plus sign indicates you are farsighted. Sphere: Measures your degree of nearsightedness (myopia) or farsightedness (hyperopia). Here are a few measurements you may take away from your vision exam: 75 D may need contacts or eyeglasses to correct their vision to see clearly. They may not really notice it in their daily lives. Most people have a mild prescription, between 0.5 to 0.75 D. How is it Measured?Īstigmatism is measured in diopters (D), a unit of refractive or optical power. Precautions against eye disease and injury, however, are generally recommended. Can it Be Prevented?įor the most part, astigmatism can’t be prevented. However, sometimes it develops after an eye disease, injury, or surgery. Most people are born with at least some degree of astigmatism, meaning it is hereditary. Light passes through the lens to the retina, the optic nerve, and, ultimately the brain. The lens sits behind the pupil in the eye to help focus light into the eye. Lenticular astigmatism is caused by a distortion in the crystalline lens.It is where light first passes through as it makes its way into the eye. The cornea is the surface of the eye, the part you touch with your contact lens. Corneal astigmatism, the most common type, is the result of an irregularly curved cornea.Because two structures of the eye can be impacted, there are two types of astigmatism:
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