Apple wants to avoid the discomfort of a user taking off an Apple AR headset like "Apple Glass," and going from darkness to the brightness of the real environment around them. If you've ever put on a Virtual Reality headset, you've noticed two things. It seems dark at first until your eyes adjust and whatever VR experience you're watching turns on. Then when you take the head-mounted display (HMD) off, you're going to be blinking because of how bright the real world seems. Apple wants to end, or at least reduce, both of these issues by instead intelligently adjusting the brightness of an AR or VR experience in a HMD.