Keeping tabs on how much time your children spend on screen can be a pain in bum and we know some parents are stricter than others, but try to set realistic limits.
As funny as it would be, your eyes wont actually turn sqaure from too much screen time, but it does have serious mental and physical effects on your health so keep an eye on it (excuse the pun).
If you want more info on screen time pop over to cybersafeireland and have a read of some of the articles there.