I think it is possible for a person to change personality when he/she gets too attached on technology?
I'm a gamer and I prefer violent gore games when playing on my computer, I think that affected that way I speak and treat others in a more aggressive way and IT's really not a nice change.
Physically, it's gonna affect your eyes, you will have an illness related to eyes later on. One bad effect is that it's gonna change how you treat other people. Less interaction with people around you will occur because you will have another world of your own now.