I know several have mentioned wearing cheater glasses with welding helmets... I ran across these on ebay. I could not find them on their web site. This is just one power. They also have other magnifications. Not pushing this guy in particular they are a few others on ebay also.

http://www.ebay.com/itm/2-00-Magnifi...item56458e7bc5

If the auction is down just search for Helmet Cheater Lens.

Another guy has the mounts for the larger 4x4 windows.