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Astigmatism is a type of refractive error in which the eye does not focus light evenly on the retina. This results in distorted or blurred vision at all distances. Other symptoms can include eyestrain, headaches, and trouble driving at night. If it occurs early in life it can result in amblyopia.
The cause of astigmatism is unclear. It is believed to be partly related to genetic factors. The underlying mechanism involves an irregular curvature of the cornea or abnormalities in the lens of the eye. Diagnosis is by an eye exam.
Three options exist for the treatment: glasses, contact lenses, and surgery. Glasses are the simplest. Contact lenses can provide a wider field of vision. Refractive surgery permanently changes the shape of the eye.
In Europe and Asia astigmatism affects between 30 and 60% of adults. People of all ages can be affected. Astigmatism was first reported by Thomas Young in the early 1800s.

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  1. Lazyfaire

    Optics and Astigmatism

    Link is from TTAG AR-15 Red Dot Sights and Astigmatism - How to Diagnose and What to Do - The Truth About Guns I have an astigmatism and it does cause me problems. Anyone else?
  2. powermad

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    I've known that I had astigmatism since I was a kid and it never really bothered me. That is till I got a decent red dot. I have a couple cheap ones in the drawer that I thought had fuzzy dots due to being cheap. Nope, the Sig Romeo 5X is funky as well and that was kinda disappointing at first...
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    Red Dot, Holographic, Prismatic: The More You Know

    While researching my next optic (Trijicon 3.5x35 variant) purchase the other day, I found a link to The Firearm Blog, with some good info pertaining to Red Dot, Holographic, and Prism optics. I thought I'd post it for your convenience. The More You Know: Living With Astigmatism When Using Red...
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