Astigmatism
Astigmatism means the cornea is irregularly shaped. This causes vision problems. The cornea is the transparent layer that covers the lens and iris. The cornea protects these structures and helps to transmit the light entering the eye. Usually the cornea is spherical, although people with astigmatism can be oval or football. This causes light to scatter instead of focusing on a single point as it passes through the cornea and result in blurring of vision.
Many people have some degree of astigmatism. It is indeed rare to find a perfectly formed eye is. It is believed that the astigmatism is hereditary, so if you have astigmatism, chances are that your children will have. Often, the disease occurs with other diseases as having low vision (myopia). Many people confuse astigmatism with “lazy eye” (amblyopia). This is not the same disease although astigmatism may contribute to amblyopia.