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Eyewear is where it began, and then it expanded to…
The wearable computing trend exploded during the early 2010's, particularly when used in conjunction with a third-party device, such as a smartphone or tablet. The Focus headset uses transcranial direct current stimulation — which basically 'zaps' the brain' — and can be used from gaming through to medical usage.
Image: Foc.us Labs
Skinput blends the 'real' from the 'unbelievable'
A Microsoft Research project, dubbed Skinput, is exactly that: an input device for the skin. It uses bio-acoustic sensing to determine finger taps on the skin, which is projected from a small pico-projector. The technology has been demonstrated in public numerous times, but is not expected to become commercially viable for the next few years.
Some wearable technologies get a little closer to the skin, though
Electronic tattoos could revolutionize the way we interact with technology and other devices as they can be applied directly to the skin. While still in early development, they could be used in medical situations such as EEGs and EMGs.
Image: John A. Rogers via CNET