My touch 4g has a yellow tint (although I've read most iOS devices after iPhone 4 tend to have yellow tint). Using touch 4G, my eyes become blurry trying to look far away and watery after using for 30 minutes such as listening to music, watching vids, browsing. I have a touch 1g (blue tint) to compare and my eyes are fine during and after use. Now the retina is obviously sharp (don't have to zoom in as much) but perhaps it is too much for my eyes? I do have a screen protector on that might have to do with it. No protector on my touch 1g. Because I can see in the reflection these lines going down the screen. I didn't put the protector on very well. The problem is I also have a cover and it was very hard to put on-don't know if I can take it off again since it is very tight. Perhaps this is the reason?