When was the last time you had your eyes checked? The iPhone has a small screen and we use it a lot, so it would not be surprising if vision changes bothered you first on your iPhone.Well, I already wear glasses. But I haven't had this headache and problems with eye till two days back when I got my iPhone. The problems have started only after using the iPhone.
Possibly, but then I am like forever in front of my PC. This is not the first time I am exposed to some digital screen either..My earlier phone was also touchscreen..
I am going to reduce the brightness completely and try it once more after sometime..