a-stig-ma-tism: a refractive error of the eye in which parallel rays of light from an external source do not converge on a single focal point on the retina.

stig-ma: a mark of disgrace or infamy; a stain or reproach, as on one's reputation.

stig-ma-ta: a mental or physical mark that is characteristic of a defect or disease

re-vi-sion: alteration, correction, emendation.
Background Illustrations provided by: http://edison.rutgers.edu/