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Attention, chocolate lovers: You may not be able to help yourselves. Swiss and British scientists have linked the widespread love of chocolate to a chemical "signature" that may be programmed into our metabolic systems.
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Astigmatism
- Overview, Causes, & Risk Factors
- Symptoms & Signs
- Diagnosis & Tests
- Prevention & Expectations
- Treatment & Monitoring
- Attribution
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Overview, Causes, & Risk Factors
An astigmatism is an abnormal curve in the optical part of the eye that produces a blurred image.
What is going on in the body?
An individual who has astigmatism has an abnormal curve in the optical part of the eye. The abnormal curve is usually in the cornea, but sometimes the lens is involved. When light enters the eye, it produces a smeared image rather than an image in sharp focus.
What are the causes and risks of the condition?
Astigmatism usually occurs naturally. It is caused by an abnormal curvature or shape of the cornea or lens. Injury to the cornea, or any other factor that could change the shape of the cornea or lens, can also cause astigmatism.