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AllAboutVision: Astigmatism
http://www.allaboutvision.com/conditions/astigmatism.htm
Guide to the causes, symptoms and treatment.
Eye Care Source
http://www.eyecaresource.com/refractive-errors/astigmatism.php
Informs aobut astigmatism causes, treatments, news and research.
MedlinePlus: Astigmatism
http://www.nlm.nih.gov/medlineplus/ency/article/001015.htm
Definition, symptoms, tests and treatment of the disorder.