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2. Astigmatism - Wikipedia

   en.wikipedia.org/wiki/Astigmatism

   Other symptoms can include eyestrain, headaches, and trouble driving at night. [1] Astigmatism often occurs at birth and can change or develop later in life. [5] If it occurs in early life and is left untreated, it may result in amblyopia. [2] The cause of astigmatism is unclear, although it is believed to be partly related to genetic factors.

3. Photorefractive keratectomy - Wikipedia

   en.wikipedia.org/wiki/Photorefractive_keratectomy

   The procedure can be used to treat astigmatism, nearsightedness, and farsightedness. [3] During the procedure, the epithelium is displaced using a diluted alcohol solution. [4] PRK has advantages over LASIK in that it avoids added complications associated with the flap created during surgery.

4. Refractive surgery - Wikipedia

   en.wikipedia.org/wiki/Refractive_surgery

   This can include various methods of surgical remodeling of the cornea (keratomileusis), lens implantation or lens replacement. The most common methods today use excimer lasers to reshape the curvature of the cornea. Refractive eye surgeries are used to treat common vision disorders such as myopia, hyperopia, presbyopia and astigmatism.

5. Why astigmatism causes blurry vision, especially at night - AOL

   www.aol.com/news/why-astigmatism-causes-blurry...

   Astigmatism, a disorder that affects how the eyes focus light, can be exacerbated at night. Blurry vision and headaches are symptoms of astigmatism. Why astigmatism causes blurry vision ...

6. LASIK - Wikipedia

   en.wikipedia.org/wiki/LASIK

   When treating a patient with preexisting astigmatism, most wavefront-guided LASIK lasers are designed to treat regular astigmatism as determined externally by corneal topography. In patients who have an element of internally induced astigmatism, therefore, the wavefront-guided astigmatism correction may leave regular astigmatism behind (a cross ...

7. Intraocular lens - Wikipedia

   en.wikipedia.org/wiki/Intraocular_lens

   A toric IOL is a type of toric lens used to correct preexisting corneal astigmatism at the time of cataract surgery. [20] Astigmatism can also be treated with limbal relaxing incisions or an excimer laser procedure. [21] [22] About 40% of Americans have significant astigmatism and thus may be candidates for a toric IOL. [22]