OS X Yosemite: Make the screen image larger using an Apple mouse
If you use an Apple mouse, you can use it to zoom in on part of your screen. Use Mouse preferences to set zoom options.
Some portable computers also support making the screen image larger using the trackpad.
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Choose Apple menu > System Preferences, click Accessibility, then click Zoom.
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Select “Use scroll gesture with modifier keys to zoom” to turn on zooming, then enter a modifier key or keys to turn zooming on or off. (To use multiple modifier keys, press them at the same time.)
If you’re using an Apple Magic Mouse, see Use an Apple Magic Mouse.
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Set additional zoom options.
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Select “Smooth images” to make the zoomed screen images appear smooth.
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Select “Zoom follows keyboard focus” to make the zoomed image shift to follow your cursor.
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Click the Zoom Style pop-up menu, then choose Fullscreen or Picture-in-picture.
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When zoom is turned on, hold down the modifier key or keys and use the scroll ball to enlarge or reduce the screen image.