People with severe astigmatism usually have blurred or distorted vision at all distances. Those with mild astigmatism may experience eye strain, headaches, or blurred vision at certain distances. 

Astigmatism may be hereditary, but environmental factors may add to the problem. Astigmatism may increase slowly over time, but usually remains relatively stable.

Symptoms can include: headaches, seeing the vertical direction of objects very clearly while the horizontal direction is blurry  (or the opposite), blurred vision, seeing a comet-like flare around lights.

Glasses and, usually, contact lenses can clear vision and relieve symptoms. Most people who wear glasses have some astigmatism. When you begin wearing corrective lenses, your new vision may be peculiar or distorted. For instance, doorways may appear curved or bent. It also is not unusual to feel uneasy walking during the first days or week of wearing your new prescription. 

You should begin wearing your new glasses gradually. Start using them for stationary activities such as reading or watching television. As you adjust to your new sight, walking and other activities will feel normal again. If, after several weeks, you do not adapt to your new vision, your eye doctor may need to adjust your prescription.