Fake X-Ray glasses?

Factual Questions
1

Hi,
I was wondering if people could tell me about fake X-Ray Glasses, like these:
http://www.gagworks.com/gwp_0500.htm
It says:

I was wondering what they’re made of, and what it looks like when you can see your bones or through clothing… I think I read somewhere that they use feathers…

http://www.mutantreviewers.com/rtheylive.html
This says:

I think he then says that he couldn’t really see much at all using the glasses.

http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=2978841933

That link shows a closer picture of the glasses.

2

The Real Secret Behind X-Ray Specs also ascribes the effect to a feather.

3

My brother (yeah, that’s it) ordered these out of the back of a comic book a long long time ago and, yes, it was a piece of feather as a “lens”. BTW, they didn’t really work.

4

Cool, thanks for that link!