Astigmatism is a common vision condition that causes blurred vision that occurs when the cornea is irregularly shaped or sometimes because of the curvature of the lens inside the eye. The condition is caused by an irregularly shaped cornea or lens that prevents light from focusing properly on the retina, the light-sensitive surface at the back of the eye. The surface of the cornea is shaped more like a football instead of round like a basketball and the eye is unable to focus light rays to a single point. In this case, vision becomes out of focus at any distance. In addition, the curvature of the lens inside the eye can change, resulting in an increase or decrease in astigmatism. This change frequently occurs in adulthood and can precede the development of naturally occurring cataracts.
Astigmatism frequently occurs with other vision conditions like myopia (nearsightedness) and hyperopia (farsightedness). Together these vision conditions are referred to as refractive errors because they affect how the eyes bend or "refract" light. If you are experiencing any of the symptoms noted below, we recommend that you make an appointment for an astigmatism test as soon as possible.
Causes & Risk Factors
Hereditary and is usually present from birth
May develop following an eye injury or eye surgery
It can occur due to a relatively rare condition called keratoconus in which the cornea becomes progressively thinner and cone-shaped
It can decrease or increase over time
Symptoms
Blurred vision at any distance
Eye discomfort
Headaches