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

What are the causes for 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 for Astigmatism?

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

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.

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 for Astigmatism?

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

When should I contact a medical professional for Astigmatism?

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



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.

  • Condition: Mild to Moderate Myopia with or without Astigmatism
  • Journal: BMC ophthalmology
  • Treatment Used: Transepithelial Photorefractive Keratectomy (tPRK) and Photorefractive Keratectomy (PRK)
  • Number of Patients: 100
  • Published —
This study compared the early outcomes of single-step transepithelial photorefractive keratectomy (tPRK) and photorefractive keratectomy (PRK) in the treatment of patients with mild to moderate myopia (nearsightedness) with or without astigmatism.
Clinical Trial
  • Status: Not yet recruiting
  • Phase: N/A
  • Intervention Type: Device
  • Participants: 55
  • Start Date: September 28, 2021
Quantification of the Visual Benefits of Soft Toric Contact Lenses Compared to Soft Spherical Contact Lenses Over a Range of Refractive Astigmatism
Clinical Trial
  • Status: Not yet recruiting
  • Phase: N/A
  • Intervention Type: Device, Procedure
  • Participants: 35
  • Start Date: April 2021
Clinical Investigation of the WaveLight® EX500 Excimer Laser for Hyperopic LASIK