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
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Can astigmatism be cured by wearing glasses?

Astigmatism cannot be completely cured by wearing glasses. Astigmatism is a common eye disease and a type of refractive error, usually caused by congenital developmental abnormalities. Some patients' astigmatism is related to poor eye habits, such as squinting for long periods, which can lead to astigmatism. The cornea of people with astigmatism has different refractive powers in the vertical and horizontal directions. Therefore, when light passes through the cornea and enters the eyeball, it cannot converge to form a perfect focus, causing the images projected on the retina to become blurry, and the patient will experience a decrease in vision. By conducting an optometric examination, the exact degree of astigmatism and the axis of astigmatism can be determined, and then corrected by wearing glasses. However, the purpose of correction is to improve the patient's vision, and it cannot eliminate the degree 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 Tao Yuan
Ophthalmology
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How can children with minor astigmatism recover?

Mild astigmatism in children refers to astigmatism below 150 degrees, which can impact vision. Currently, once the degree of astigmatism is established, there are no effective non-surgical treatments available to reduce it. Since children cannot immediately undergo surgery to correct astigmatism, the alternative is to wear frame glasses or rigid corneal contact lenses to correct their vision and enhance their eyesight. In subsequent life, it's important to develop good eye habits, avoid squinting when looking at things, not use the eyes at close range for extended periods, and try to prevent the degree of astigmatism from increasing. After reaching adulthood, astigmatism can be corrected through laser surgery.

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Written by Tao Yuan
Ophthalmology
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Can myopia surgery correct astigmatism?

Myopia surgery can also remove astigmatism. Both myopia and astigmatism are common ophthalmological diseases, and they are different types of refractive errors that can occur simultaneously. Currently, there are various surgical methods to correct myopia, such as excimer laser surgery, full femtosecond laser surgery, half femtosecond laser surgery, and posterior chamber intraocular lens implantation for phakic eyes. Whatever the type of surgery mentioned, it can correct and treat myopia while simultaneously removing the patient's astigmatism. Prior to surgery, a detailed optometric examination and ocular examination are required. Based on the patient's eye condition and specific degrees of myopia and astigmatism, a corresponding surgical plan is designed.

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Written by Hu Shu Fang
Ophthalmology
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Astigmatism refers to a type of refractive error in which the eye does not focus light evenly onto the retina, often due to an irregular shape of the cornea or lens.

Astigmatism is a type of refractive error. Because our eyes are not a perfect sphere, they are more like an egg shape, with different meridians having different refractive powers. Thus, after imaging, the axial images may form in front of or behind the retina, rather than forming a focal point on the retina. Normally, astigmatism of some small degrees and with good axial alignment may not significantly affect vision. However, high degrees of astigmatism, especially irregular astigmatism, will definitely impact visual quality and require the prescription of special lenses to correct the astigmatism.