The lenses are made of wall storage magnets. Similar to these!
In order to add some better steampunk colors, I added brass pins. And the eye fittings are made of scrap leather that I used for a sheath for a knife. The pins are more decorative than anything else.
I love the "cracks" that are on the lenses. They are actually just scratches that were made when my drill slipped on a hole I was making. It turned out to add the perfect touch!