Intel Mac :: How To Set Auto Zoom In - Font Size Very Small In Apps

I'm using the newest IMac. And the problem is every time I put data using number (iwork) for accounting, the font is very very little almost unable to see by normal. I must pinching my eyes a little bit to see it clearly. Should I change something in setting and how? and this is happen when using safari too. From the first time I bought it, I never change the setting except to change username and password to login in. So I let it all in default version. I'm using IMac 27-inch, Mac OS X Lion 10.7.4 processor 3.1GHz intel core i5. Nothing changed since I bought it till now. It's very annoyed and difficult for me to input, edited, even read it as report.