The futures so scary you don't want to see it?

[gunug]

  I'm not sure what these really do for you in the case of "danger" (say a gasoline truck approaching at a high rate of speed) but quite commonly ignorance is not bliss:

The Nope Glasses are two LCD shutters mounted in a pair of 3D printed glasses. On the bridge of the glasses is an APDS 9960 gesture sensor that tracks a hand waving in front of the glasses. Waving your hand down in front of the glasses darkens the shutters, and waving up makes them clear again. Waving left flashes between clear and dark, and waving right alternates each shutter.

In all seriousness, there is one very interesting thing about this project: how [matt] is attaching these LCD shutters to his glasses. This was done simply by taking a picture of the front and top of his glasses, converting those to 1-bit BMPs, and importing that into OpenSCAD. This gave him a pretty good idea of the shape of his glasses, allowing him to create an ‘attachment’ for his glasses. It’s great work, and we’d really like to see more of this technique.

https://hackaday.com/2018/06/10/super-chromatic-peril-sensitive-sunglasses/