Reiner J
Klin Monbl Augenheilkd. 1977 May;170(5):707-12.
A astigmatic eye corrected with a spectacle lens results in an anamorphotic optical system which gives a distorted image of the environment on the retina. Fusion disturbances were ppresent especially in oblique astigmatism. The explanation for this can come either from a displacement of the image points on the retina or from the prismatic side effects of the spectacle lenses.