Abstract: the main reason for astigmatism is that the curvature of the two perpendicular intersecting directions on the cornea is different, resulting in different refractive power. The different directions of corneal curvature mainly come from congenital genetic factors. It was noted that the children and grandchildren of astigmatism patients have similar astigmatism and similar degree., According to relevant statistics, about 25% ~ 30% of teenagers have ametropia and astigmatism, that is, many teenagers have both myopia and astigmatism., Whether myopia or hyperopia, many people only pay attention to the degree of the lens when matching glasses, but they are indifferent to astigmatism. Therefore, many people with myopia will still feel blurred after wearing glasses, and they must squint to see more clearly. Moreover, after reading for a long time, the eyes often swell and ache. Go to the doctor for examination and say it’s astigmatism., As we all know, in order to obtain clear photos, the object image must be accurately focused on the negative. Similarly, under normal circumstances, light from 5 meters or 5 meters away passes through the refractive structure of the eyeball, and its focus just falls on the retina to form a clear image, so as to have normal vision. This ideal refractive state is called emmetropia. If the length of the anterior posterior diameter of the eyeball is abnormal or the refractive power of a certain place in the refractive system changes, the focus will fall in front or behind the retina, which is called myopia or hyperopia. This situation means that the refractive power in each meridian direction changes, but the change value is the same. If the diopter in each meridian direction is different, it can not focus into a point on the retina, but a line, which is astigmatism., The main reason for astigmatism is that the curvature of the two perpendicular intersecting directions on the cornea is different, resulting in different refractive power. The different directions of corneal curvature mainly come from congenital genetic factors. It was noted that the descendants of astigmatism patients have similar astigmatism and similar degree. Of course, the acquired disease interference and improper use of eyes are also easy to cause astigmatism., The main symptoms caused by astigmatism are visual fatigue, sore eyes, headache and so on. Because the retina cannot form a clear image, patients often narrow their eyes into a slit in order to see clearly. Many patients do not know the truth and often complain that their glasses are low. Experts remind: if your vision decreases and you have visual fatigue symptoms, you should have mydriatic optometry. Through inspection, we can accurately know whether astigmatism exists or not? What is the degree of astigmatism? At the same time, it can also check whether there is myopia or hyperopia, and can wear glasses for correction according to the results of optometry. Myopia or hyperopia can be corrected simultaneously with astigmatism.,
according to relevant statistics, about 25% ~ 30% of teenagers have ametropia and astigmatism, that is, many teenagers have both myopia and astigmatism.
whether myopia or hyperopia, many people only pay attention to the degree of the lens when matching glasses, but they are indifferent to astigmatism. Therefore, many people with myopia will still feel blurred after wearing glasses, and they must squint to see more clearly. And after reading for a long time, the eyes often swell and ache. Go to a doctor for examination and say it’s astigmatism.
it is well known that in order to obtain clear photos, the object image must be accurately focused on the negative film. Similarly, under normal circumstances, light from 5 meters or 5 meters away passes through the refractive structure of the eyeball, and its focus just falls on the retina to form a clear image, so as to have normal vision. This ideal refractive state is called emmetropia. If the length of the anterior posterior diameter of the eyeball is abnormal or the refractive power of a certain place in the refractive system changes, the focus will fall in front or behind the retina, which is called myopia or hyperopia. This situation means that the refractive power in each meridian direction changes, but the change value is the same. If the diopter in each meridian direction is different, it can not focus into a point on the retina, but a line, which is astigmatism. The main reason for the astigmatism of
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is that the curvature of the two perpendicular intersecting directions on the cornea is different, resulting in different refractive power. The different directions of corneal curvature mainly come from congenital genetic factors. It was noted that the descendants of astigmatism patients have similar astigmatism and similar degree. Of course, the acquired disease interference and improper use of eyes are also easy to cause astigmatism. The symptoms caused by
and
astigmatism mainly include visual fatigue, sore eyes, headache and so on. Because the retina cannot form a clear image, patients often narrow their eyes into a slit in order to see clearly. Many patients do not know the truth and often complain that their glasses are low. Experts remind: if your vision decreases and you have visual fatigue symptoms, you should have mydriatic optometry. Through inspection, we can accurately know whether astigmatism exists or not? What is the degree of astigmatism? At the same time, it can also check whether there is myopia or hyperopia, and can wear glasses for correction according to the results of optometry. Myopia or hyperopia can be corrected simultaneously with astigmatism.