Learn About Astigmatism

What is the definition of Astigmatism?

Astigmatism is a type of refractive error of the eye. Refractive errors cause blurred vision. They are the most common reason why a person goes to see an eye professional.

Other types of refractive errors are:

  • Farsightedness
  • Nearsightedness
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What are the causes of Astigmatism?

People are able to see because the front part of the eye (cornea) is able to bend (refract) light and focus it onto the retina. This is the back inside surface of the eye.

If the light rays are not clearly focused on the retina, the images you see may be blurry.

With astigmatism, the cornea is abnormally curved. This curve causes vision to be out of focus.

The cause of astigmatism is unknown. It is most often present from birth. Astigmatism often occurs together with nearsightedness or farsightedness. If astigmatism gets worse, it may be a sign of keratoconus.

Astigmatism is very common. It sometimes occurs after certain types of eye surgery, such as cataract surgery.

What are the symptoms of Astigmatism?

Astigmatism makes it hard to see fine details, either close up or from a distance.

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What are the current treatments for Astigmatism?

Mild astigmatism may not need to be corrected.

Glasses or contact lenses will correct astigmatism, but do not cure it.

Laser surgery can help change the shape of the cornea surface to eliminate astigmatism, along with nearsightedness or farsightedness.

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What is the outlook (prognosis) for Astigmatism?

Astigmatism may change with time, requiring new glasses or contact lenses. Laser vision correction can most often eliminate, or greatly reduce astigmatism.

What are the possible complications of Astigmatism?

In children, uncorrected astigmatism in only one eye may cause amblyopia.

When should I contact a medical professional for Astigmatism?

Contact your health care provider or ophthalmologist if vision problems worsen, or do not improve with glasses or contact lenses.

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What are the latest Astigmatism Clinical Trials?
Comparative STudy of the ARGos Biometer Compared to UltraSound Biometer in B-mode in Case of Measure Failure With a the Conventional Biometer

Summary: Biometry has become one of the most important steps in modern cataract surgery. The axial length of the eye may be measured by ultrasound (either contact or immersion) or by optical means. Non-contact optical biometry has become the gold-standard because of its ease of use, accuracy, and reproducibility. However, the main disadvantage of the optical methods is their inability to obtain axial lengt...

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Clinical Investigation of a Small Aperture Extended Depth of Focus Intraocular Lens in Patients With Complex Corneas

Summary: The objective of this study is to evaluate the clinical outcomes of the IC-8 IOL implanted in patients with complex corneas after crystalline lens removal.

What are the Latest Advances for Astigmatism?
Roles of Toric intraocular Lens implantation on visual acuity and astigmatism in glaucomatous eyes treated with iStent and cataract surgery.
A comparison of sutureless flanged fixation and 4-point Gore-Tex fixation for scleral-fixated intraocular lenses: a pilot study.
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Two-mm chord manual small-incision cataract surgery with phacofracture: A brief exposition of the surgical technique.
Who are the sources who wrote this article ?

Published Date: August 22, 2022
Published By: Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.

What are the references for this article ?

Chiu B, Young JA. Correction of refractive errors. In: Yanoff M, Duker JS, eds. Ophthalmology. 5th ed. Philadelphia, PA: Elsevier; 2019:chap 2.4.

Jain S, Hardten DR, Ang LPK, Azar DT. Excimer laser surface ablation: photorefractive keratectomy (PRK), laser subepithelial Keratomileusis (LASEK), and Epi-LASIK. In: Yanoff M, Duker JS, eds. Ophthalmology. 5th ed. Philadelphia, PA: Elsevier; 2019:chap 3.3.

Olitsky SE, Marsh JD. Abnormalities of refraction and accommodation. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 638.

Valluru G, Klawe J, Liu B, Ramulu P, Ahmad S. Characterizing astigmatism in the United States. J Cataract Refract Surg. 2022;48(5):519-527. PMID: 34417780 pubmed.ncbi.nlm.nih.gov/34417780/.