Astigmatism is a more complex type of refractive error of the eye. The cornea is responsible for bending light rays from an image so that they focus on a specific point on the retina (back of the eye). Eyes with astigmatism are unable to focus light onto just one point, and end up having multiple focuses. In addition, these focuses do not occur right on the retina, rather in front of or behind. This causes blurry vision at both close and far distances. Astigmatism can be corrected through glasses, special contact lenses, or surgically through laser eye surgery or specialized IOLs.
Here is a video that presents an overview of astigmatism. You may change the audio and subtitles to the language of your choice by hovering over the bottom right of the video and clicking on the “CC” icon.
This next video reviews some options to correct astigmatism.