Ask a Macologist
If you ever want to get a closer look at something on your computer screen, there’s a quick way to zoom in on whatever you’re pointing at.
First, make sure “Zoom” is enabled by going to System Preferences and clicking on “Universal Access”. Make sure “Zoom” is set to “On”. Now, zooming in on wherever you’re pointing is incredibly easy.
On a laptop: hold the control button on your keyboard, and do the “scroll” gesture: two fingers on the trackpad, moving up & down to zoom in & out.
On a desktop: hold the control button on your keyboard, and use the scroll wheel (or scroll ball) on your mouse to zoom in and out. This also works on the Mighty Mouse: just brush your finger up and down where a scroll wheel would normally be.
You can even fine-tune how your screen follows the cursor when zoomed in. Under “Universal Access” just click “Options…” next to “Zoom” and try out the different modes.