During normal vision, the light first comes through the cornea to the eye in, then passes through the pupil and lens, and sets the light is focused at a spot on the retina at the back of the eye, the Macaulay or yellow spot.
Astigmatism is caused by deformation of the eye: the shape of the cornea is oval and less symmetrical than the normal round shape. Due to this deformation causes light to focus on points in front of and / or behind the retina, rather than on the retina itself. Images are blurred or distorted.
People with astigmatism may also suffer from frequent headaches and eye pain. Astigmatism is a common disorder and can occur with nearsightedness and farsightedness. Blurred or distorted vision caused by astigmatism can be corrected with glasses or contact lenses.
Many people who need glasses or contact lenses to see clearly in the distance, getting after their fortieth even bother reading the newspaper. You can change your glasses and reading glasses natural exchange every time, but it can also happily convenient. Multi focal lenses (and glasses) combine two strengths, allowing you to see both far and near focus. This works well? Marianne tried it out.