Last week I bought a Macbook Air with 13" and I haven't been able to sit in front of it for that long, the resolution makes everything too tiny specially because I work on a lower resolution laptop the whole day and only use the MBA at night. I have no idea if I will get used to it or if I just have to return it. I've been thinking about how wrong the future is going to be to our eyes if we keep improving the resolution of screens when operating systems don't deal that well with it. (I use Windows 7 on the MBA and I can't just go for a smaller resolution because type gets blurred.)
I have the same problem. Everything is very tiny. I just end up pinch zooming most web pages. I'm thinking of buying a desktop monitor and hooking it up with the MBA.
In all honesty I think I have to go see an optometrist also. It's long due. I'm getting these headaches staring at the MBA screen, never used to get them before.
You can change the text scaling in Windows whilst keeping the screen resolution native: Control Panel\Appearance and Personalization\Display - try setting it to Medium.
I know about this but as a web developer/designer I would prefer not to mess with anything other than the resolution. I too am thinking the possibility of using an external screen and use the Macbook Air as a desktop because it's really fast. But I'm very sad about this outcome.
You know when I tried setting it to Medium or Large it almost looked like Metro!