I saw laser-cut prototypes of something similar at Stanford around the med school at some sort of "science fair" ~6 years ago. The cost is mostly the magnifying

I saw laser-cut prototypes of something similar at Stanford around the med school at some sort of "science fair" ~6 years ago. The cost is mostly the magnifying bead. What's also great, besides being cheap, is that it doesn't need power, packs down quite small, and can work in the field.