All VBC View Ports are all one piece solid glass. Condensation will only effect the inside and outside surface.   Thought and care should be given to all shields with view ports where extreme swings in temperature and humidity occur.  Remember only glass cleaner should be used to clean view port glass.  Take care to cover the view port when using W-D 40, or similar lubricants when conducting preventative maintenance on your shield.  Using BLUE Painter tape to cover the view port when using WD-40 is also a good idea.  VBC