How many types of regular astigmatism are recognized?

The correct understanding of regular astigmatism recognizes two primary types, which are myopic astigmatism and hyperopic astigmatism.

Regular astigmatism is characterized by the fact that the meridians of the eye that are affected have consistent curvature differences. This means that the principal meridians are perpendicular to each other. The two forms of regular astigmatism provide distinct visual challenges and require specific approaches for correction, typically through the prescription of cylindrical lenses that match the curvature and orientation of the cornea.

While there are various classifications and types of astigmatism in total, the classification within regular astigmatism specifically identifies these two types based on the refractive error. Therefore, the recognition of two distinct types aligns with standard clinical understanding in optometry and vision science.