Click the eye icon next to a layer, group,
or layer effect to hide its content in the document window. Click
in the column again to redisplay the content. To view the eye icon
for styles and effects, click the Reveal Effects In Palette icon .
Choose Show Layers or Hide Layers from the Layers menu.
Alt-click (Windows) or Option-click (Mac OS) an eye icon to display only the contents of that layer or group. Photoshop remembers the visibility states of all layers before hiding them. If you don’t change the visibility of any other layer, Alt-clicking (Windows) or Option-clicking (Mac OS) the same eye icon restores the original visibility settings.
Drag through the eye column to change the visibility of multiple items in the Layers palette.