Vision problems > Astigmatism


What is astigmatism?

Astigmatism is an optical/eye defect or vision problem that occurs when the rays enter the eye parallel, focusing on two different points.


This is manly due to the corneal toricity, i.e that it is hardly ever totally spherical like a ball and is more bent in a meridian point than in its perpendicular. Each of these meridian points focuses the rays on a different point. 


What symptoms does it produce?

On a practical level, and explained in simple terms, the patient sees out of focus, sometimes with double image or even slightly deformed.



How is it treated?

Astigmatism is compensated with glasses or contact lenses that focus the image correctly in the patient's retina. It can be corrected with laser surgery and phakic lenses and, in the case of patients who undergo a cataracts operation, it can be compensated with toric intraocular lenses

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Astigmatism is an optical defect that causes for the patient to see out of focus, sometimes with double image and even slightly deformed.

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