They do ruin your eyesight. There is an experiment you can do: if you watch your screen without glasses for an hour (make sure you do not watch it from up too c

They do ruin your eyesight. There is an experiment you can do: if you watch your screen without glasses for an hour (make sure you do not watch it from up too close, the further away you are the better, let it be a bit blurry but still readable), a weaker pair of glasses will work, too.