[5] In addition to its magnitude and direction, astigmatism may also be classified based on its symmetry. Regular astigmatism is symmetric around the visual axis and classically shows a "bow tie ...

Astigmatism is the most common refractive error, defined as a difference in the regular curvature of the eye, which causes blurred image through the eye. Refractive astigmatism (RA) is the total ...

A fairly prevalent vision disorder that results from an irregularly shaped cornea or lens is astigmatism, which causes hazy or distorted vision. Choosing between prescription spectacles and ...