Which is better, letting kids watch their favorite shows on TV or iPad/iPhone?

I don't think either one is harmful if the watching is in moderation. I read an article arguing that the reason children wear glasses earlier in age now more than ever is not because of television, but because they are reading, writing and viewing things at a much earlier age, yet their eyes are not necessarily "developed" enough to handle the strain. Here is a link to an article I found about a similar subject. http://www.slate.com/id/2249406/

1. A pair of eyewear like Taime computer eyewear(http://www.halovis.com)  that can filter UV and blue-light is your best choice. 2. Use blue-light protection app on your smartphones.(Android: https://play.google.com/store/apps/details?id=jp.ne.hardyinfinity.bluelightfilter.free) 3. Reduce your time on playing computer games, watching TV etc.

I think I have read an article recently that children's wearing glasses is due to starting working with their eyes in earlier years than ever before. That is not only true due to watching television, but also to starting reading and writing at early ages. Small children's eyes are not ready yet for that, and are also growing at that time. To my mind it's better to watch TV formats on the big screen, since many shows are not produced to be shown on small displays and thus the strain on the eyes should be higher with watching on the iPad, iPhone, especially if it's for a longer period of time.

Neither on TV nor on iOS devices to watch series is good for your kid. You haven't known how blue light and glare emitted from the screens hurt the eyes. But it is not to let your kid abondon the electronic devices. You can control the time. And you know what? You should give a plan for protecting your kid's eyes now. And the first step is to prepare a pair of computer eyewear which can effectively block the blue light and the glare. Here you can learn more: http://www.halovis.com