Can you wear contact lenses with 200 degrees of astigmatism?

Written by Tao Yuan
Ophthalmology
Updated on September 01, 2024
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Astigmatism of 200 degrees or less can be corrected by wearing regular contact lenses. However, when purchasing lenses, one needs to divide the astigmatism diopter by two and incorporate it into the prescription for myopia during the fitting process. If a patient's astigmatism exceeds 200 degrees, they typically are not suitable for regular contact lenses. Instead, they may opt for custom contact lenses with astigmatism correction or use rigid corneal contact lenses for correction. Patients with astigmatism should promptly visit an ophthalmology department at a hospital for an optometry examination to accurately determine their astigmatism and undergo vision correction tests. Following this, a doctor will issue a prescription for fitting contact lenses.

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Written by Tao Yuan
Ophthalmology
54sec home-news-image

Why is astigmatism more serious than nearsightedness?

Astigmatism and myopia are both common eye diseases and are two different types of refractive errors. Under the same degree of refractive error, astigmatism can cause more damage to visual function than myopia. This is because patients with astigmatism usually experience abnormal development of the cornea, leading to different refractive powers in different directions. As a result, when light passes through the cornea and enters the eye, it cannot converge to form a single focus, but instead forms a line intersection, which greatly affects the quality of vision. On the other hand, myopia is caused by an overly long eye axis or excessive corneal refractive power. When light passes through the cornea and enters the eye, although it cannot focus accurately on the retina, it can still form a focus. Therefore, the impact on vision is less severe than that of astigmatism.

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Written by Zheng Xin
Ophthalmology
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How to relieve headaches caused by astigmatism in the eyes?

Eyestrain and headache can be understood in two senses: First, if one experiences astigmatism when viewing objects, accompanied by headaches and eye pain, it is possible that glaucoma is present. This condition is also associated with increased eye pressure and swelling pain in the eyes. If this is the case, treatment to lower eye pressure and treat glaucoma is necessary. The second meaning involves astigmatism identified through an eye examination, indicating a refractive error. If the astigmatism correction in the glasses worn is not suitable, prolonged viewing can lead to visual fatigue, eye pain, and accompanying headaches. In this case, a detailed eye examination followed by wearing appropriate glasses is needed to alleviate the symptoms.

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Written by Lian Wen Xi
Pediatrics
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Astigmatism in children is caused by what?

The majority of astigmatism in children is caused by congenital factors, that is, genetic factors. If one or both parents of the child have astigmatism, the probability of the child having astigmatism is higher than that of other children. There are also a few cases where a child's astigmatism is caused by acquired factors, such as surgery, trauma, or illness, all of which may cause changes in the curvature of the cornea and lens. Additionally, a lack of outdoor activities and poor eye habits might also promote the development of astigmatism. It is recommended that once a child is diagnosed with astigmatism, they should go to a reputable hospital for examination and then get appropriate treatment to improve the condition, otherwise, it could impact their vision.

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Written by Li Zhuo
Ophthalmology
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Can children with astigmatism undergo laser surgery?

Firstly, laser surgery is generally performed after the age of 18, as people's eyes continue to grow. This means that just like when a person stops growing taller, the eyes also stop growing at a certain age. If laser surgery is performed too early, while the eyes are still growing, the results may regress over time. Therefore, astigmatism in children should only be addressed after they reach adulthood, usually after the age of 18, but we generally recommend waiting until after the age of 21. Additionally, if the progression of the eye prescription is less than 50 to 100 degrees per year, the surgery outcomes are more likely to be stable. Generally, laser surgery is primarily used for myopia, which pertains to issues with seeing distant scenes, whereas astigmatism, which generally affects horizontal vision, is usually not corrected through laser surgery.

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Written by Hu Shu Fang
Ophthalmology
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Can contact lenses correct astigmatism?

Contact lenses can be prescribed with a certain degree of astigmatism correction. If the astigmatism is less than 100 degrees, it can be converted into half of the spherical degree to create a prescription, and standard contact lenses can be worn to see clearly. If the astigmatism is greater than 100 degrees but less than 300 degrees, it is necessary to first prescribe sufficient spherical degree, then determine the astigmatism's axis and degree, and manufacture special astigmatic contact lenses. Wearing these can be more comfortable and provide clearer vision. Generally, very high degrees of astigmatism cannot be corrected with contact lenses, and wearing frame glasses is required instead.