Faced with the need to find his glasses in a dark house, the nearsighted Adam Engst discovers that holding the iPhone in front of his face with the flash-enabled Camera app running lets him see perfectly. 

During the WWDC keynote, Apple unveiled the Vision Pro, its long-rumored mixed-reality headset. Adam Engst looks at what it is, what it’s good for, and who will want to use it. He also ponders some of the implications should it become popular.