A type of WearComp / WearCam that captures the light that would normally enter one or both of the user's eyes (usually by reflecting it into a camera with a mirror mounted in front of the eye), transforms it into data, processes this light-data in some way with a computer worn on the body (e.g. for Mediated Reality), then projects it back onto the user's eye with an aremac.

Thus, an EyeTap is a device that allows the eye to, in effect, function as both a camera and a display.