Adobe Acrobat 7 Professional - Manual (Page 65)

Viewing layers
Information can be stored on different layers of an Adobe PDF document. The layers that
appear in the PDF document are based on the layers created in the original application.
You can examine the layers and show or hide the content associated with each layer by
using the Layers tab in the Navigation pane. For more information on working with
layers, see
About Adobe PDF layers .
Layers tab A. Eye icon indicates a displayed layer B. Hidden layer
To view layers:
1. Click the Layers tab on the left side of the window, or choose View > Navigation Tabs >
Layers.
2. Click the eye icon to hide a layer's content. Click the empty box to show a hidden
layer's content. A layer is visible when the eye icon is present and hidden when the eye
icon is absent.