Astigmatism is a condition in which parts of the eye are shaped abnormally, causing a refractive error (mistakes in how your eye sees light) and making it difficult to focus on objects clearly. Astigmatism comes in two varieties: regular, and irregular. Regular astigmatism is caused by an abnormal shape to the lens or cornea of the eye, which divides the light that hits it into two points of entry into the eye. The resulting effect is like looking at two very slightly different views of the same object; for example, a round dot may appear to be a stretched-out oval or even a line to a person with astigmatism, depending upon how severe their case is.
Irregular astigmatism is caused by corneal scarring; scattering in the crystalline lens is also a possible cause. Either way, irregular astigmatism cannot be corrected with eyeglasses, but can be corrected with the use of contact lenses. Contact lenses can assist with regular astigmatism, as well; a special kind of contacts called toric lenses are needed to correct both crystalline lens and corneal distortions. Toric lenses have a particular shape: one raised ring within another larger raised ring, like two donuts nested together. Toric lenses can correct both kinds of astigmatism, though they must continue tobe used because they are not a permanent fix.
Symptoms of astigmatism include blurry vision, particularly horizontal or vertical blurring, seeing straight lines as curved or tilted, headaches, eyestrain, fatigue, and frequent squinting to try to see more clearly. Milder cases may not have many or any of these symptoms except for the difficulty in focusing on objects. Astigmatism is a very common vision problem; several studies of local populations found that over 30 percent of people had the condition.
Astigmatism is commonly treated with eyeglasses, contact lenses, or various types of laser surgery. Regular LASIK surgery, lens transplants, and corneal re-shaping via rigid gas-permeable contacts are among the permanent fixes for the condition. The natural alternative is eye exercises, which are said to cure nearsightedness and farsightedness as well if followed properly. There are different eye exercise programs for different conditions.
Astigmatism is a condition in which parts of the eye are shaped abnormally, causing a refractive error (mistakes in how your eye sees light) and making it difficult to focus on objects clearly. Astigmatism comes in two varieties: regular, and irregular. Regular astigmatism is caused by an abnormal shape to the lens or cornea of the eye, which divides the light that hits it into two points of entry into the eye. The resulting effect is like looking at two very slightly different views of the same object; for example, a round dot may appear to be a stretched-out oval or even a line to a person with astigmatism, depending upon how severe their case is.
Irregular astigmatism is caused by corneal scarring; scattering in the crystalline lens is also a possible cause. Either way, irregular astigmatism cannot be corrected with eyeglasses, but can be corrected with the use of contact lenses. Contact lenses can assist with regular astigmatism, as well; a special kind of contacts called toric lenses are needed to correct both crystalline lens and corneal distortions. Toric lenses have a particular shape: one raised ring within another larger raised ring, like two donuts nested together. Toric lenses can correct both kinds of astigmatism, though they must continue tobe used because they are not a permanent fix.
Symptoms of astigmatism include blurry vision, particularly horizontal or vertical blurring, seeing straight lines as curved or tilted, headaches, eyestrain, fatigue, and frequent squinting to try to see more clearly. Milder cases may not have many or any of these symptoms except for the difficulty in focusing on objects. Astigmatism is a very common vision problem; several studies of local populations found that over 30 percent of people had the condition.
Astigmatism is commonly treated with eyeglasses, contact lenses, or various types of laser surgery. Regular LASIK surgery, lens transplants, and corneal re-shaping via rigid gas-permeable contacts are among the permanent fixes for the condition. The natural alternative is eye exercises, which are said to cure nearsightedness and farsightedness as well if followed properly. There are different eye exercise programs for different conditions.