Eye tracking technology: How does it work? 

I’ll start by answering the inevitable question I always get when someone first sees me using my eye gaze: “Yes, I am doing that all with just my eyes.”

In this article, we’ll look at eye tracking technology, or eye gaze, and the following information:

  • What it is
  • How it works
  • What you can do with it
  • Common challenges for eye gaze users
Illustration: Profile shot of user with headphones

Yvette, Fable Community Member

“Web access, game playing, and environment controls all become accessible with eye tracking technology.”

What is eye gaze?

Eye gaze, or eye tracking, is pretty much what it sounds like; it is a way of controlling a device simply by looking at it. The tracker monitors the user’s eye movements, and then uses that data to understand what spot on the screen is being looked at. By adding a few mouse command features and a virtual keyboard to the screen, the user is able to completely access their computer without moving any other part of their body! While this may appear to be a marvel from the future, it has actually been in the making for a few decades. In recent years, though, the eye tracking industry has made progress that continues to advance the capabilities and increase the popularity of such technology. 

How does it work?

It’s a two part thing: Hardware and software. 

The “typical” hardware looks like a long bar positioned along (or built into) the bottom edge of the computer screen. This bar has three sets of near-infrared lights (left end, center and right end) and an optical sensor that are directed in the general direction of the user’s eyes. The tracker and computer will evaluate where the reflection of the light is on the eyeball, in comparison to the location of the pupil, then use the collected data to tell in which direction the user is looking. 

There is another type of eye tracker which looks more like a traditional camera