DS is 15 months and whenever we put on a DVD for him, prob only once a day about 4pm, he'll sit for about two mins and then he's up and standing right up against the screen. We try and put him back on the floor a decent distance from teh screen but he gets right back up there! Apart from the constant sticky handprints all over the tv, how bad is this for his eyes? Are we giong to have to cancel all TV completely?