astigmatism

A Viral Tweet Is Making People Realize They Might Actually Have Astigmatism
Image Source/Getty Images / @AmbientGryph/Twitter

Astigmatism is a condition that affects the shape of a person's cornea (the outermost clear layer of the eye). Rather than being a uniform round shape, the cornea is more of an oval in individuals with astigmatism.

This odd shape causes light to refract strangely when it enters the eye, and can lead to some pretty weird optical effects.

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