'astigmic' originates from Greek via New Latin, specifically from Greek astigmatikos (ἀστιγμάτικος), where the prefix 'a-' meant 'not' or 'without' and 'stigma/stigmat-' meant 'mark' or 'point'.

'astigmic' changed from New Latin/Greek forms such as 'astigmaticus'/'astigmatikos' and the related English adjective 'astigmatic'; 'astigmic' developed as a shorter adjectival variant in English usage.

Initially it referred to the concept 'without a single point' (i.e., lacking a single focal point) in optics, and over time it came to be used to mean 'relating to or showing astigmatism' in modern usage.