view-limiting instrument training device for pilots

The clip-on feature is convenient, more so that the typical fogged safety glasses. The construction is kinda flimsy: I added a piece of thin music wire to hold the front straighter. I've used them for (3) IFR training sessions. They do a pretty good job of blocking out almost everything, if you position them correctly on your glasses (although nothing will stop you from cheating if you turn your head - ) It'd be really nice if some sort of a protective case was included: I keep these in my pilot flight bag, and managed to find a box to keep them in. Otherwise, they'd probably get squashed, bent, or broken.