If you are a Hackaday reader, you probably know what a Fresnel lens is. You find them in everything from overhead projectors to VR headsets. While it seems commonplace now, the Fresnel lens was an ...

The projection screen was made by sandwiching ... the projected image was very dark around the periphery, so [Matt] added Fresnel lenses on either side of the screen. This straightens out the ...

Imagine a world where augmented reality glasses are as lightweight and comfortable as everyday sunglasses, or where ...