What kind of astigmatism is characterized by greater power in the vertical meridian than in the horizontal meridian?

With-the-rule astigmatism is characterized by greater power in the vertical meridian than in the horizontal meridian. In this type of astigmatism, the cornea is more curved vertically than horizontally, resulting in different refractive powers in these meridians. This condition typically affects the ability to see clearly at certain angles because the eye does not focus light evenly on the retina.

With-the-rule astigmatism is commonly observed in younger individuals and often results in vertical lines appearing clearer than horizontal lines. Understanding this condition is crucial for accurate diagnosis and appropriate correction, such as through glasses or contact lenses, tailored to address the specific refractive error present in the vertical and horizontal planes.