Google's Project Glass was the company's attempt at showing the next generation of eyewear. However, is that kind of technology available?

The glasses combine a small form factor covering one eye without lenses, with the ability to see information on a heads-up display. Many are, however, questioning the feasibility of the technology though, and whether Google over-hyped the product in the launch video.

Pranav Mistry, the MIT Media Lab researcher and an inventor of the SixthSense computing system, says the device can't produce the content seen in the video.

When Wired asked Google for more information in an e-mail, the company said it wasn't prepared to share more information.

Blair MacIntyre, director of the Augmented Environments Lab at Georgia Tech, also thinks the device is fake. He says the video shows the HUD across a field of view that covers both eyes, whereas the device only covers one. Moreover, the image remains perfectly still despite the wearer moving around a lot.

He also says that everything is in focus, which wouldn't happen. Users would need to either focus on the outside world, or on the HUD, and move between the two. Another reason the device may not be possible is because the image quality is perfect in all types of light, both indoor and outdoor. Even devices such as the new iPad, which has a Retina display, offer poor quality in outside sunlight.

Google is releasing Android-based glasses that are for priced between $250 to $500. Wired reported on April 5 that the device needs to dynamically focus on work, as users flip between the HUD and outside world, though that technology is around two years away.

Other criticisms against the project are the durability of the device, with the small size glasses looking quite fragile. In a real world scenario, dropping the device is possible, while some have questioned the ability to focus on tasks such as managing e-mails while walking around town.

The lens-less glasses also mean users, who have poor eyesight, will not be able to use the device.

(reported by Jonathan Charles, edited by Surojit Chatterjee)