I've been considering getting the macbook air for some time now. However, i'm not really sure if i should buy the 11 inch or the 13 inch, mainly because of the screen size. I've been concerned as to whether the 11 inch screen is too small. I've seen many reviews, but most focus on the screen's color quality rather than the screen size itself. For example, they usually don't give an opinion as to whether the screen is too small so as to severely strain ones eyes.. Give me some advice. For 11" inch owners, how is the screen size? How many hours can you go without feeling "eye strain"? And is this "eye strain" for older people whose eyes have already worn out? Because i'm a college student ( 20 yrs old),.