Astigmatically

astigmatically corrected lenses; an astigmatically neutral incision

[…] it [the Impressionist movement] set clear-sighted students practising optical distortion, so as to see things myopically and astigmatically;

His eyes no sooner focused on the time of trains for Oxford than the letters (white) upon their background (black) had leap-frogged astigmatically across his retina, leaving him in dizzied indecision.