When you need a little help seeing items on the screen or you make presentations with detailed items, try Windows 7 Magnifier.
Click the Windows button and type “mag” to access it. You’ll see the Magnifier tool pop up. The default setting magnifies the whole screen. This is useful for teaching in a large classroom.
To change from Full Screen mode to Lens mode, click on the Views dropdown menu and choose Lens. The toolbar changes to a magnifying glass after a few seconds. Just click it to retrieve the tool bar to change this setting.