Underfire.
I don't think you are really making sense.
Laser rangefinders that are not in the visible spectrum can of course be blocked without causing optical degradation through a port. This cannot be done for a visible laser for the simple reason that visible lasers are in the visual spectrum. To stop them you must block that bit of the visible spectrum. This, by definition degrades the optics.
Any goggles are exactly the same, and unless they block multiple frequencies will only protect against one laser frequency despite there being many out there.
Re the window coatings to protect against listening in.
B@llocks. Some energy will be reflected back, and that's all you need.