Layers in Current Visible Extent

Greetings,

I'm looking to turn off all of the layers NOT in the current visible extent. I figured a Python Add-In would be the easiest way to achieve this functionality. I've snooped around the arcpy classes and their methods, and I'm not seeing what I'm looking for (i.e. Layer.inVisibleExtent).

Does this mean I'll have to create an add-in with .Net/ArcObjects? I've seen the powerpoint that's floating around about accessing Arc Objects with Python, but don't necessarily want to go that route.

Thanks,

Colin