Don't be scared - it's actually pretty simple. I started with some cheap welding goggles and added electronics from there. One of the main challenges was to keep the light from the LEDs separated from the light from the outside world coming into my eye. Here's an explanation of the pieces of the cross-section from the front to the back.
- The lens holder is an original part of the goggles, basically a ring that screws onto body to hold onto the various lenses.
- The glass lens is a flat, boring glass disc that came with the goggles. I kept it to make sure the front of each lens has a uniform, shiny surface.
- The gasket is just a tiny plastic ring that acts as a small spacer between the glass and plastic.
- The plastic disc is a disc of opaque, white plastic I cut from an Ikea storage box. The front is lightly textured and the back has a regular triangular tessellation carved into it with a dremel. Through the center is a small hole (roughly 1.5cm diameter) through which I can see.
- The black foam tube is a small tube I cut/carved from EVA foam (craft foam) to keep the LED light from making it into my eye by maintaining a solid tube of darkness. The squishiness of the foam also helps keep everything in place.
- Six LEDs are mounted evenly around the foam tube, mounted onto a piece of mirrored acrylic simply by pulling the leads through tiny holed drilled through the acrylic. Acrylic because it's solid and can be clear in the center, mirrored to bounce all the possible light out of the front of the lens. The mirroring was a film applied to the front side, but tinfoil or aluminium tape would work equally well. I made sure to cut away the mirroring in the center of the acrylic so I could see through.
- The foam disc is for comfort, to protect my face from the electronics, and to make sure to block any light that comes through or around the acrylic.