noun. A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.

noun. In ophthalmology, a defect in the refractive apparatus of the eye, the curvature of the refracting surfaces being greater along certain meridians than along others, so that rays of light proceeding from an external point do not converge to a point upon the retina, but to a line.

noun. A similar defect in a lens.

noun. A defect of the eye or of a lens, in consequence of which the rays derived from one point are not brought to a single focal point, thus causing imperfect images or indistinctness of vision.

noun. A defect of a lens such that light rays coming from a point do not meet at a focal point so that the image is blurred.

noun. A disorder of the vision, usually due to a misshapen cornea, such that light does not focus correctly on the retina causing a blurred image.

noun. (optics) defect in an optical system in which light rays from a single point fail to converge in a single focal point

noun. (ophthalmology) impaired eyesight resulting usually from irregular conformation of the cornea; common in nearsighted people

"After the surgery, I definitely saw better - my previous vision had been -7 and -7.5 with severe astigmatism, which is a short step away from being totally non-functional - but after two weeks, I went back in for another corrective round."

emmetropia  hyperopia  myopia  

stigma  stigmatize  

astigmatic  astigmatically  

condition  status  

stigmatism  

atresia  blear  feeble-mindedness  hypothyroidism  leaveth  

astigmia