Windows: With Aero, Microsoft added a nifty magnifier tool to Windows 7 and Vista that enables you to zoom in—regardless of the application—on the fine details on the screen. For faster zooming, here are some keyboard shortcuts.
You may already know about the CTRL plus + keyboard combination that enlarges web pages in most browsers and zooms in for other applications like Photoshop. Hit CTRL and the - (minus) sign simultaneously and you zoom out.
As handy as CTRL + and CTRL - are, however, not all applications support those keyboard magnification controls.
For those instances, you can use Windows' built-in Magnifier tool instead. Hit the Windows key and + to zoom in on the display (by default, in 100% increments, but you can change this in the tool settings). Hold down the Windows and - keys at the same time to zoom back out.
Other quick keyboard shortcuts, once you have the Magnifier tool up, include:
CTRL + L to bring up the lens display view
CTRL + D to dock the magnification area.
CTRL + F brings you back to the full screen mode.
Read more: Lifehacker