The eyeball style vandal domes are sturdy but if the glass lens is hit with a hammer or rock like object, it will break pretty quickly.
While no camera is vandal proof, the resistance is a matter of degrees.
Plexiglas like domes offer a little more resistance. These vandal resistant dome cameras can often withstand a hit from a hammer. In fact, there has been an account of a vandal trying to hammer a camera, resulting in the hammer rebounding back into the vandal’s face.
Browse USpy’s various dome cameras: Dome Cameras