Currently, the ratio of people being the refractive error of the eye (myopia, hyperopia, astigmatism) has risen very high, especially in children. The number of children must wear glasses on as much, in that there are many children wear glasses not true numbers, impair vision, cause the children encounter many difficulties in learning and participating in physical activities. Not only that, more and more children suffer disabilities "myopia" is very difficult to detect. Many other potentially disease of the eyes are well appear a lot, affect the future
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