Can myopia surgery correct astigmatism?

Written by Tao Yuan
Ophthalmology
Updated on September 02, 2024
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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 Li Zhen Dong
Ophthalmology
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Can pseudomyopia cause astigmatism?

Pseudomyopia generally does not involve astigmatism. Pseudomyopia is caused by ciliary muscle spasm, while astigmatism is due to changes in the curvature of the cornea, or changes in the eyeball itself; these two are not the same. Pseudomyopia can be completely cured with proactive treatment, adequate rest, reducing close-up activities, avoiding eye fatigue, and using eye drops that alleviate ciliary muscle paralysis, such as low-concentration atropine eye drops and digoxin eye drops. If not treated actively, prolonged pseudomyopia can turn into true myopia. True myopia involves elongation of the eye axis, leading to blurred distance vision but clear near vision. Therefore, when this occurs, a proper dilated refraction test should be conducted. (Medication should be used under the guidance of a physician.)

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Written by Tao Yuan
Ophthalmology
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Are there any treatments for high myopia and high astigmatism?

High myopia combined with high astigmatism can be treated in the following ways: First, correction by wearing frame glasses is the most widely adopted treatment method currently, which is affordable and safe. Second, using rigid corneal contact lenses for correction, which provide higher image quality than regular frame glasses. Third, correction can be done through laser surgery, such as excimer laser surgery, femtosecond laser surgery, and full femtosecond laser surgery, but it is only suitable for adult patients. Fourth, correction can be accomplished by implanting phakic intraocular lenses in the posterior chamber, generally suitable for patients whose corneal condition does not permit laser surgery, at a higher cost compared to laser surgery.

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Written by Wang Fang
Ophthalmology
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Will astigmatism cause the pupils to enlarge?

Astigmatism of the eye is a type of refractive error caused by an uneven curvature of the cornea's surface, resulting in different refractive powers along different axes. Once astigmatism occurs, particularly with a high degree of astigmatism, there can be a noticeable decrease in vision, distortion in sight, or in severe cases, significant eye fatigue. However, it generally does not lead to pupil dilation. Pupil dilation is caused by the paralysis of the ciliary muscle due to internal and external factors, resulting in enlarged pupils. Therefore, if symptoms of astigmatism appear, it is advisable to visit a hospital promptly for accurate diagnosis and appropriate treatment.

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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 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.