Astigmatism is a type of refractive error caused when either the cornea or the lens has mismatched curves. This makes vision blurry because there are two image points.
Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission.
Check out these best-sellers and special offers on books and newsletters from Mayo Clinic Press.
Make a gift to our 2025 Drive to Cure Cancer and transform the way cancer is treated and defeated.