“ To quickly zoom in to any part of your screen, hit the Windows key and +. 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 + ALT + L to bring up the lens display view CTRL + ALT + D to dock the magnification area. CTRL + ALT + F brings you back to the full screen mode.
Quickly Zoom In and Out of Any Windows 7 Application - Lifehacker
