Astigmatism is a condition that causes blurred vision when the lens or cornea of an eye has an irregular surface contour, according to Mayo Clinic. Rather than having a consistently smooth curvature, an astigmatic lens or cornea has abnormal curves and flattened areas, changing how the eye processes light.Know More
As light passes into the eye, the cornea and lens work together to focus incoming rays toward the retina and produce a clear image, explains the American Optometric Association. Shape irregularities can change how different sections of the cornea or lens surface refract light, distorting the eye's focal point. For example, the corneal surface may be oval-shaped instead of spherical. If the condition is not present at birth, it may develop after a surgery or injury.
Astigmatism is known as a refractive error, and physicians usually classify it as corneal or lenticular, notes Mayo Clinic. Blurriness caused by refractive distortion occurs in the same direction as the abnormal curvature, such as vertically, horizontally or diagonally. In addition to vision problems, people with astigmatism may develop headaches or eye strain.
Serious cases are often accompanied by myopia, known as nearsightedness, or hyperopia, known as farsightedness, according to Mayo Clinic. In a nearsighted eye, an excessively curved cornea shortens the point of focus, making far off objects seem blurry. In farsighted vision, a cornea lacking curvature or an unusually short eye makes the point of focus longer than normal, so closer objects appear blurry.Learn more about Vision
Astigmatism makes objects at any distance appear blurry and wavy, says WebMD. This occurs due to an eye that is not completely round, which creates a type of refractive error.Full Answer >
Lights in your peripheral vision, or eye floaters, are most often caused by changes in the jelly-like substance in the eyes due to age, explains the Mayo Clinic. They also might be caused by inflammation, bleeding in the eye or a torn retina.Full Answer >
People should get their eyes checked because the early signs of some eye diseases are silent or vague, according to the Centers for Disease Control and Prevention. Also, a child may be too young to know that her vision is not as sharp as possible and may need corrective lenses.Full Answer >
During cataract surgery, the eye's lens is removed, and an artificial lens is substituted, states the National Eye Institute. Surgery is required when vision loss from the cataract is severe and disrupts daily life. Up to that point, cataracts are treated with new glasses, better lighting, anti-glare sunglasses or magnifiers.Full Answer >