free from, or corrected for, astigmatism; specif., designating a compound lens made up of one converging and one diverging lens so that the astigmatism of one is neutralized by the equal and opposite astigmatism of the other
See anastigmatic in American Heritage Dictionary 4
adjective
Free from astigmatism. Used of a compound lens in which the separate components compensate for the astigmatic effects of each lens.