Introduction of Myopia
Myopia, commonly known as nearsightedness, is the most common eye problem in this industrial world, which is a big concern for people worldwide. The research shows one out of four Americans has myopia. The symptom is people can see clearly at a certain distance, but when the object is a little far away, the vision will become blurred. That is because the light from distant object can not focus on retina, but in front of the retina. One fact is though myopia is a
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