Combined issues: Farsightedness (hyperopia) is an eye too short, light rays converge to a point behind the retina. Astigmatism is either cornea, lens, or both result in an optical light path as if the light were passing through a glass football, creating a complex image (conoid of sturm, a great topic for wikipedia). Uncorrected hyperopic astigmatism would produce a conoid of sturm behind the retina.
Answered 1/9/2015
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