title: Transformation of sphero-cylinders. I. Ranking procedure.
abstract: Parametric statistical analysis requires a rule by which the variates are quantitatively ranked. In this study an isomorphic transformation of sphero-cylinders is developed and two alternative ranking hierarchies for the sphero-cylinder are proposed.
mesh_terms: D001251:Astigmatism / Q000534:rehabilitation; D006801:Humans; D007909:Lenses; D008433:Mathematics; D055095:Optics and Photonics; D014792:Visual Acuity