Use a Zoom Window in Mac OS X
Another option when enabling zoom in OS X Lion is to use a smaller floating zoom window, rather than zooming into the entire screen.
- Open “System Preferences” from the Apple menu, and click on “Universal Access”
- Click on the “Seeing” tab and under “Zoom”, click ON, and then click the checkbox next to “Zoom in window”
The default zoom shortcut is Control+Scrolling, but this and other aspects can be adjusted by clicking on the “Options” button under the Zoom section of the Universal Access panel.
Think of it like a virtual magnifying glass, similar to what is in the Preview.app but for everything shown on screen.