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A head-mounted display , both abbreviated HMD, is a display device, worn on the head or as part of a helmet, that has a small display optic in front of one or each eye .

A head-mounted display (or helmet-mounted display, for aviation applications), both abbreviated HMD, is a display device, worn on the head or as part of a helmet, that has a small display optic in front of one (monocular HMD) or each eye (binocular HMD).

There is also an optical head-mounted display (OHMD), which is a wearable display that can reflect projected images and allows a user to see through it.

A binocular head-mounted display (HMD).
A professional head-mounted display (HMD).
A man controls Google Glass, a type of optical head-mounted display, using the touchpad built into the side of the device.
A HTC Vive headset.