![]() Researchers at SUNY – Stony Brook are working on a system where text is selected by a wink rather than a pause. By placing electrodes on the skin around the eyes, variations in voltage can be measured that indicate horizontal and vertical movement. With a keyboard with so many options on the screen, a system that relies on timed responses can create frequent errors from glancing or unintentional, natural movement (15).Įlectro-oculography is a relatively new technique that utilizes the small voltage (+.4 to +1 millivolts) of the eye with respect to the retina. This can be very time consuming, but is comparatively better than a simple onscreen keyboard. The interface is a series of boxes by selecting one, a user will be able to choose from a series of sub-boxes. ERICA (Eye-gaze Response Interface Computer Aid) is one of the most popular forms of this type of tracking. This requires the user to stare at a particular item for a few seconds in order to select it, but has the benefit of being unobtrusive to the individual (14). The angle of this reflection can then be measured and used to determine the location of the eye to move the cursor or pointer on the screen. “Traditional” eye tracking technology uses an LED directed to the pupil of the user’s eye, causing a reflection. Eye tracking is a growing field of alternative computer inputs for the many disabled individuals who have very little mobility except for their eyes. ![]()
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