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Astigmatism mainly originates from the corneous tunic. When the curvature of cornea is not uniformed with its various meridians, then the object’s focus it is not possible to find itself on the retina.  

This refractive disease is called astigmatism (corneal astigmatism). However, the astigmatism is rarely owed to irregular crystalloid lens that is found behind the iris of the eye or even in abnormality in the curvature of rear pole (retinal astigmatism). The astigmatism can coexist with myopy and hypermetropia as well.

Astigmatism has as basic symptom, blurred sight. Moreover, it can also create kopiopia, in other words, lassitude at the overview of some objects that is practically expressed by lassitude, dizziness, redness when somebody studies for hours or uses PC. The symptoms, usually, are worsened if the individual tries read with incomplete lighting. A usual symptom of astigmatic deviation is the evening headache. The diagnosis of astigmatism takes place during the ophthalmological test where refraction is checked (refractive control). It is a fact, that in most cases the astigmatism coexists with other refractive illnesses as myopy, hypermetropia and presbyopia (depending on the age of the patient).