Krause K, Gerding H
Univ.-Augenklinik Münster.
Klin Monbl Augenheilkd. 1989 Jan;194(1):65-7. doi: 10.1055/s-2008-1046339.
The correction of astigmatism by means of spectacle lenses involves anamorphotic distorsions. Dramatic changes in image formation can be detected in the VECP.