If you have low vision, or find your self squinting to see really tiny, Windows Phone 8 has a really nice feature named “Screen Magnifier”. This could help if you’re in a dark area (like on a plane, or cab at night), so it’s a nice feature to learn and love.
It’s a little hard to get used to,m because of the two finger – double tap that needs to happen, but with a little practice it become second nature.
Enjoy!
http://scottcate.looplogic.com/windows-phone-8-screen-magnifier