(AP Photo/Elizabeth Dalziel)
Stephen Hawking, who suffers from ALS, uses a cheek-controlled communication system custom-designed by Intel to suit his needs. The software is now open source, but remains aimed at developers for the time being.
Julius Sweetland wasn't happy with the software options available to people with severe physical and speech impairments, so he spent the past three and a half years building his own eye-controlled interface as a cheap alternative to the competition.
With a $100 eye-tracker and his free software, people with amyotrophic lateral sclerosis (ALS, also known as Lou Gehrig's disease) or other impairments can type, click, and even speak through a computer without the use of their hands or voice.
In a two-minute demo, Sweetland, a 32-year-old London-based developer, shows off the latest build of his software, OptiKey. A large keyboard fills the screen and Sweetland, shown holding his hands up on a small embedded webcam feed, types using his eyes alone. Next, with an eye-controlled "click," the software reads back what he's written.
A device similar to a webcam tracks Sweetland's eye movements as he shifts his gaze from one letter to the next. Automatic suggestions pop up like they would on an iPhone, but he hardly seems to need them as OptiKey correctly determines the words he wants by analyzing the letters he's looked at.
(Youtube/Julius Sweetland)
Developer Julius Sweetland shows off typing without the use of his hands in the first OptiKey demo video.
As shocking as it may seem to the average user, OptiKey is not groundbreaking technology. In fact, the study of eye-tracking dates back to the 19th century and its use for computer control began in the 1980s.
However, many eye-tracking interfaces are prohibitively expensive, making computer use difficult or even impossible for people — like those with ALS — who are unable to use a keyboard, mouse, or voice controls. Speaking with Business Insider, Sweetland said that this isn't fair. "There are a lot of 'off-the-shelf' solutions out there ... [but] you're looking at thousands of dollars for something like this."
It's true. On the lower end of the spectrum, the PCEye Go from Tobii will cost you $1,995. And commentors in a Reddit thread discussing OptiKey reference alternatives priced as high as $14,000 or $17,000, which Sweetland calls "absurd."
Cheaper eye-tracking hardware has come to the market, but there isn't always accessibility software to use with it. The Eye Tribe offers a $99 eye-tracker but, since it's currently aimed at developers, it comes with little software of its own. That makes it a perfect match for the OptiKey, and it comes as no surprise that the two projects endorse each other.