Most of us have heard of Google Glass. There is another type of smart eyeglasses that you can get. They look more like regular eyeglasses. You can use head motions to show or dismiss displays. It uses something called VCSEL (vertical-cavity surface-emitting laser) to shine into your eyes and projects to the back of your retina (retinal projection). It is made by Intel.
You can see the text just below your usual line of site. They are working to perfect them to be able to show you what you want when you want it. Maybe you are near a couple restaurants. It can show you the yelp review. Or you ask Alexa for a recipe – you can see it on your glasses. They look pretty lightweight next to Google Glass. Only you know you are reading them.