Kids love hi-tech stuff. They learn how to work an iphone or a laptop pretty fast. Sometimes they beg for more "screen time".
My opinion that they should not watch too much TV and neither should they look at the smartphone or laptop for too long.
I would gave a firm "NO" and sometimes I just grab my iPhone away from her. Sometimes, I turn it off and tell her that it is out-of-battery.
It is definitely not an easy job to protect their fragile eye-sight. What are your opinion and what is your strategy?
Do you just take it away?