Insiders familiar with the matter claim that Amazon's Lab126 group is working on a pair of glasses with Alexa support via a bone-conduction audio system. However, this accessory is expected to come without a camera or a screen similar to those used by products like the Google Glass smart glasses.
https://www.notebookcheck.net/Amazon-allegedly-working-on-Alexa-enabled-smart-glasses.249682.0.html