Final answer:
Astigmatism is the eye disorder caused by an uneven cornea or lens, resulting in a fuzzy or elongated image. This condition can be corrected with lenses that have a cylindrical correction designed to compensate for the eye's uneven focus.
Step-by-step explanation:
The disorder of the eye that is due to the cornea or lens being uneven, resulting in a fuzzy image, is astigmatism. Astigmatism leads to an unevenness or asymmetry in the focus of the eye whereby different parts of the lens system may project images to different locations.
For those with astigmatism, rays passing through various regions of the eye may not correctly converge, often causing images to appear elongated and less distinct. This condition is mostly attributed to irregularities in the shape of the cornea, but it can also stem from lens irregularities.
Astigmatism can be at least partially corrected with specially designed spectacles or contact lenses that contain a cylindrical correction to counterbalance the eye's irregularities, as opposed to the spherical corrections typically used for nearsightedness or farsightedness.