To such let me explain that I am suffering from astigmatism.
"Humorous Ghost Stories"
Dorothy Scarborough
This defect is called astigmatism and is very troublesome, making it hard to fit the eye with glasses, as the glasses have to be ground irregular in shape.
"A Handbook of Health"
Woods Hutchinson
If, on the other hand, the only difficulty is a confusion of x and z with c and g, it means that there is a strain due to astigmatism, and that the child should be sent to an oculist.
"Civics and Health"
William H. Allen