Video shows what astigmatism means. 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.. 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.. astigmatism synonyms: astigmia. Astigmatism Meaning. How to pronounce, definition audio dictionary. How to say astigmatism. Powered by MaryTTS, Wiktionary