Are electronic screens bad for infants?

Apparently, under 2 - NONE at all. Above 2 - recommended less than 2 hours at a stretch but commonly recognized as unrealistic in today's world. one suggestion is to get protective eye glasses for the kids - but i wonder if there is a simpler solution to just stick some protective film on the ipad http://www.babycentre.co.uk/a25006035/is-screen-time-good-or-bad-for-babies-and-children