Regular astigmatism is symmetric around the visual axis and classically shows a "bow tie" on corneal topography. The power of each meridian is successive as the meridians travel 180 degrees.

Guided by preoperative corneal topography, patients with varying degrees of corneal astigmatism can be placed into a variety of dioptric categories. These categories dictate a systematic ...

with corneal changes potentially playing a part. Astigmatism is the most common refractive error, defined as a difference in the regular curvature of the eye, which causes blurred image through ...

The researchers found that in 2015, the prevalence rate of refractive astigmatism of at least 1.0 diopter (D) was 21.4% and the prevalence rate of corneal astigmatism of at least 1.0 D was 59.8% ...

In a cohort of 21,655 children ages 6 to 8 years, the prevalence rate of refractive astigmatism of at least 1.0 diopter (D) increased from 21.4% in 2015 to 34.7% in 2022-2023, and corneal ...