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Yes, we've had TVs and computers for a long time, but TVs are usually watched from across the room, and computers from a couple feet away. Tablets and smartphones, which are held closer to the eyes, are a much more recent invention. Young people now are the first generation who are growing up using these devices. So I think this is why some people in this thread are saying it is too soon to know if longterm use of these devices from a young age will have an effect on the eyes.
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