The Eyeballs: What They See Is What You Get
The eyeballs in the Layers palette determine which layers will be visible in your document as well as which ones will print. The eyeballs turn on and off in a toggle effect when you click them: Now you see them, now you don't.
If you turn off all the eyeballs in the Layers palette, Photoshop will fill your screen with a checkerboard. This checkerboard indicates that there's nothing visible in the document. (If Photoshop filled your screen with white instead, you might assume that there was a layer visible that was filled with white.) You can think of the checkerboard as the areas of the document that are empty. When you view a single layer, the checkerboard indicates the empty areas of that layer. ...
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