A normal eye is between 50 degrees of nearsightedness and 50 degrees of farsightedness, called orthopia, 50 degrees of nearsightedness or nearsightedness, and 50 degrees of farsightedness or farsightedness. 50-300 degrees of myopia is low myopia, 300-600 degrees is moderate myopia, and 600 degrees or more is high myopia, while 50-300 degrees of farsightedness is low myopia, 300-600 degrees is moderate farsightedness, and 600 degrees or more is high farsightedness. degrees is moderate hyperopia, and 600 degrees or more is high hyperopia. For astigmatism, normal people do not have astigmatism, but most people have 25-50 degrees of astigmatism in their eyes, which can also be considered normal. Astigmatism above 50 degrees is considered abnormal, astigmatism of 50-200 degrees is low astigmatism, and astigmatism above 200 degrees is high astigmatism, which needs to be taken seriously and even needs glasses to be worn.