These are those patients who wear glasses with plus cylinder numbers having specific angles. This type of defect may not be very high but creates much discomfort and headache. These glasses may be plus number or may be minus number or even mixed. Typically they are always trying to see without glasses and squeezing their eyes
These patients naturally have an eye defect that develops during the period from childhood to adulthood. Actually the curvature of their cornea is not symmetrical in vertical and horizontal zones. This has been explained in the following pictures
How astigmatic patients looks without glasses and what is the difference when they see through their glasses. This can be visualized by looking at these pictures
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