Other refractive errorsĪstigmatism may occur in combination with other refractive errors, which include: Astigmatism isn't caused or made worse by reading in poor light, sitting too close to the television or squinting. Blurred vision may occur more in one direction: horizontally, vertically or diagonally.Īstigmatism may be present from birth, or it may develop after an eye injury, disease or surgery. You have lenticular astigmatism if your lens has mismatched curves.Įither type of astigmatism can cause blurred vision. You have corneal astigmatism if your cornea has mismatched curves. Astigmatism is a type of refractive error.Īstigmatism occurs when the cornea or lens is curved more steeply in one direction than in another. These two images overlap or combine and result in blurred vision. If either the cornea or the lens is egg-shaped with two mismatched curves, light rays aren't bent the same, which means that two different images form. A cornea or lens with such curvature bends (refracts) all incoming light equally to make a sharply focused image directly on the retina at the back of the eye. In a perfectly shaped eye, each of these elements has a round curvature, like the surface of a smooth ball.
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