astigmatism_tilly by keralaguest

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									                                  Astigmatism



What is an astigmatism?



Astigmatism is a refractive error caused by an imperfection of the curvature of
your eye. This occurs when the cornea or lens has an irregular shape, instead of a
smooth and normal curvature. As a result, light rays entering the eye will not
bend properly causing the light rays not to focus properly on the retina. This
causes blurred or distorted vision at any distance.



It is unknown what causes astigmatism, but it is
thought to be heredity. Most people are thought to be
born with it. However, this is not always the case. An
astigmatism is fairly mild eye disorder in which may
not require you to have any symptoms or any
treatments.



Common Treatments

    Contact lenses
    Eye glasses
    Lasik Surgery
      References
      http://www.mayoclinic.com/health/astigmatism

      http://www.aoa.org

      Cassin,B., & Solomon, S. (1980). Dictionary for eye terminology 5th edition.

       Gainesville, Fl. Triad Publishing Company.

o            www.us.cibavision.com/lenses/astigmatism.shtm
o
o          Ophthalmology made ridiculously simple, Stephen
    Goldberg,M.D.2008,Miami, Fl.
      Pgs 14-15.

								
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