How can I turn off or blank out the secondary monitor?

I currently have a three monitor setup.  Two 27" verticals and one 27" iMac between the two.  When I work it is great, however when my wife wants to use the computer, she feels overwhelmed by the displays, is there a way to disable the two external monitors when she logins in; but have them available when others (myself) use the iMac?  Possibly a script or another app...
Running Yosemite.

Hi,
For other older notebook computers with a backlit keyboard, try one of the following methods depending on your model, to turn the backlit keyboard on or off.
If the spacebar has a keyboard icon on the left side, press and hold the fn key and then tap the space bar one time.
Press the f12 key.
Press the f5 key.
Regards.
BH
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