This is an excellent application of the technology. Things can be expanded to many things from research to entertainment (like video games based on eye tracking)
The device itself is a little too bulky. I think a better version could be built for everyday usage. Sometimes products like this takes a lot of time to go into the hands of the general populations and the design could hinder things even more. If we could make a cooler design and push Autofocal Glasses to the markets, it will help a lot of people.