My dad gave me a pair of war-surplus goggles many (*MANY*) years ago. It had interchangeable lenses, one of which was dark red. I would wear this for 15-20 minutes before going outside to look at the night sky. Many years later, I had an app on my Palm Pilot that showed the positions of constellations in the night sky; it was called "Planetarium" IIRC, and had a "Night Mode" that showed in red.
Heh... I just pulled it out of a drawer and it still works!

"Planetarium" in Night Mode.