The Smart Goggle records everything the wearer sees - and can recognise objects, reports the Daily Telegraph.
So you can tell the glasses what you're looking for and the technology will show you when, and where, you last saw it.
Inventor Yasuo Kuniyoshi and his team at Tokyo University School of Information Science and Technology have created the world's most advanced object recognition software.
If a user initially tells the glasses the name of everything he or she looks at, the glasses will remember.
They can then locate the last time the object was seen if it is misplaced, and replay the footage.
In the future, the glasses will be more intelligent than the wearer, able to identify objects their owner doesn't even recognise.
The experimental model is too large for everyday use, but Prof Kuniyoshi's team is working on miniaturising it.
In theory, the only question that the glasses will not be able to answer is: "Where have I put my glasses?" (Daily Telegraph)