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The Collaborative International Dictionary
Anastigmatic

Anastigmatic \An*as`tig*mat"ic\, a. [Pref. an-not + astigmatic.] (Optics) Not astigmatic; free of astigmatism; -- pertaining to a lens or lens system, and used especially of a lens system which consists of a converging lens and a diverging lens of equal and opposite astigmatism but different focal lengths, and sensibly free from astigmatism.

Wiktionary
anastigmatic

a. (context of the eye or a lens system English) Free from astigmatism

WordNet
anastigmatic
  1. adj. pertaining to a lens or lens system free of astigmatism (able to form point images) [syn: stigmatic]

  2. not astigmatic [syn: stigmatic] [ant: astigmatic]