Besides the question above, this is probably the most common question we hear. Let’s start by pronouncing it correctly. It’s UH-STIG-MA-TISM and it’s not a stigma. It’s a type of refractive error, like nearsightedness or farsightedness, which can cause blurriness, eyestrain, and headaches. Anatomically, it is an irregularity in the normal shape of the cornea. Instead of being round like a baseball, the cornea can have an oblong shape, more like a football. It is usually corrected with glasses, contacts, or laser surgery.