My son start wearing glasses as me, I wearing because of nearsightedness (myopia) since primary time, but he wearing because of astigmatism(散光). Astigmatism is typically corrected with a cylindrical lens. This disorder is caused by a non-uniform curvature in the refractive surfaces of the eye, which leads to an abnormality in focusing the light rays on the retina. As a result, a part of the light rays are focused on the retina and the other part is focused behind it or in front of it.
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