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{{main|Optical head-mounted display}}
Augmented Reality HMDs also known as Optical head-mounted displays or OHMDs. The displays of these devices are transparent. They allow users to see through them while projecting images and information in front of the users' eyes.
==Types of HMDs==
[[Slide-on HMD]] is the most primitive of all HMD types. These devices rely on the inserted smartphones to do all of the leg work. [[Discrete HMD]] contains a display and some electronics for [[tracking]] and other functions. While they are more advanced than the Slide-ons, Discrete HMDs still require connections to PCs for processing. [[Integrated HMD]] is the most sophisticated of them all. From display to tracking to processing, it has everything needed for VR or [[AR]] within the HMD.
===Slide-on HMD===
[[Slide-on HMD]], also known as Smartphone mount, is the cheapest and most accessible form of [[VR]]. The Slide-on consists of a smartphone holder, [[lenses]] and some form of basic [[input]]. A smartphone is inserted into the HMD and the entire device is played upon the eyes of the user to create the VR experience. The Slide-on utilizes the smartphone for display, processing and [[rotational tracking]]. Some Slide-on HMDs such as the [[Gear VR]] use their own built-in [[IMUs]] instead of relying on that of the smartphones.
Popular Slide-on HMDs:
*[[Google Cardboard]]
*[[Samsung Gear VR]]
===Discrete HMD===
[[Discrete HMD]] also known as Tethered HMD supplies everything required for an [[immersive]] [[VR]] experience aside from the processing. It contains display, lenses, rotational tracking, [[positional tracking]], audio and advanced input. For processing, Discrete HMDs are connected to PCs through cables. While this type of HMD is less mobile than its 2 counter parts, it is able to deliver the best VR experience.
Popular Discrete HMDs:
*[[Oculus Rift]]
*[[HTC Vive]]
*[[PlayStation VR]]
New
*[[HTC Vive Pro]]
===Integrated HMD===
[[Integrated HMD]] is the most sophisticated and expensive type of HMD and [[OHMD]]. This independent computing device is able to deliver [[VR]] and/or [[AR]] experiences without any external hardware such as PC or smartphone. It contains everything from display to processors to camera and is able to display stereoscopic 3D images, perform complex tracking and utilize advanced input methods. Currently, most of Integrated HMDs are AR OHMDs with high price point and target only business professionals.
Popular Integrated HMDs:
*[[Microsoft HoloLens]]
*[[Google Glass]]
*[[Magic Leap]]
==Components of HMDs==
===Processors===
[[Category:Terms]]
