Phòng và kiểm soát trẻ cận thị
Cận thị là sự suy giảm khả năng nhìn xa, trong đó ảnh của sự vật không rơi đúng vào võng mạc mà rơi ra phía trước võng mạc, phải nhìn một thấu kính phân kỳ...
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