Astigmatism - Type

What type of astigmatism do you have?

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What are the different types of astigmatism?

There are various classification systems for astigmatism, based on the anatomical source of the astigmatism, the regularity/ irregularity of astigmatism, or the direction of astigmatism.

Most astigmatism in the human eye has its source within the cornea, although there are irregularities of the lens that can lead to astigmatism, known as lenticular astigmatism.

Most corneal astigmatism is regular, meaning that the cornea is most curved (steepest) 90 degrees away from the surface of the cornea that is the least curved (flattest) and that the transition from most curved to least curved surface occurs in a regular manner. Regular astigmatism can be corrected with glasses, soft lenses, rigid lenses, or refractive surgery.

Irregular astigmatism is defined as arising from any corneal surface that is neither spherical nor regularly astigmatic. Irregular astigmatism cannot be corrected with glasses or soft contact lenses.

A historical classification of astigmatism differentiates with the rule astigmatism from "against the rule" astigmatism. In with the rule astigmatism, the steepest curvature (most curved part to the cornea) lies in or close to the vertical meridian, similar to the surface of a football lying on it side. In against the rule astigmatism, the steepest (most curved) part of the cornea is in or close to the horizontal meridian, similar to the surface of a football standing on end.

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