The main symptoms of astigmatism are blurred vision, double vision, deformation and other problems. Astigmatism is a problem of corneal curvature, which is caused by inherited factors and acquired factors. The acquired factors are most commonly caused by eye trauma, eye surgery and eye lesions. Astigmatism can be divided into regular astigmatism and irregular astigmatism. Regular astigmatism corrected vision can be improved, but irregular astigmatism corrected vision cannot be improved, The problem of keratoconus and keratopathy should be excluded. The astigmatism treatment mainly includes frame glasses, corneal shaping glasses and surgical treatment. The astigmatism can be divided into mild astigmatism less than 100 degrees, moderate astigmatism 100~200 degrees, severe astigmatism 200~300 degrees and severe astigmatism more than 300 degrees.
