Viewport problem

Hi Guys , I’ve run across a function in the viewport that i’ve never seen before, and have accidentally turned on and have no idea how to turn off…
Essentially in solid view mode, parts of the mesh that are near by are shown as wire frame, I want to see ONLY the opaque front facing polys as you normally would. How can I get this view back to normal. N.B. this is NOT the Limit selection to visible, that works fine and displays all verts behind model… Any help appreciated Cheers
See image link below…
http://s9.postimage.org/6onui93wf/Capture.png

Check your view clip start and clip end values. You get a similar appearance if the former is ridiculously small and the latter ridiculously large

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