Astigmatism is a vision condition that causes blurred vision due either to a misshapen cornea or sometimes because of an irregular curvature of the lens inside the eye. Problems with either the cornea or the lens prevents light from focusing properly on the retina. When this happens, vision becomes blurred and/or distorted at any distance. Read more about astigmatism here.

The following videos show how an astigmatic person is affected both visually and internally, and what a cylinder is.

To watch any of these videos full screen, simply click on the button, found in the lower right hand corner of the YouTube player.