What causes flash eyes?

Astigmatism belongs to a kind of refractive error, mainly due to the cornea each meridian arc is not consistent, the outside parallel light after the eye refractive system adjustment, on the retina to form scattered image. Common reasons include congenital and acquired, congenital astigmatism, need to be timely optometry, clear degree, wear the corresponding degree of glasses for correction, serious can be refractive surgery treatment. Acquired astigmatism is more common in excessive use of the eye, rubbing the eye with the hand, and excessive compression of the cornea by the eyelid, causing astigmatism in the cornea. Pay attention to the correct use of the eye in life to prevent excessive visual fatigue. If astigmatism has been formed, symptomatic treatment should be given after detailed examination in the hospital.