ELI5: Explain Like I'm 5

Optical head-mounted display

An optical head-mounted display (OHMD) is a type of eyewear which uses special lenses, a screen, and a computer to create images so it looks like they are floating in front of you. The screen is usually attached to a headset, and the lenses help to focus the images on each eye. These devices can be used in virtual reality gaming and other activities.