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During normal vision, light first enters the eye through the cornea, then passes through the pupil and the lens where it is focused at a point on the retina at the back of the eye. Astigmatism is cau...
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Kids 14 and Younger Only Need 2 HPV Vaccine Shots: CDC

But agency's revised guidelines still recommend 3 shots for 15- to 26-year-olds

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