Narbis glasses have dry sensors to monitor a wearer 's brainwaves . Lenses will darken if the system detects a user has lost focus on a task . When they start paying attention again , the lenses will clear . Exercises improve concentration , sleep and stress levels , inventor claims . Comment:
Narbis glasses have dry sensors to monitor a wearer 's brainwaves . Lenses will darken if the system detects a user has lost focus on a task . When they start paying attention again , the lenses will clear . Exercises improve concentration , sleep and stress levels , inventor claims . Glasses system can be pre-ordered on Kickstarter from $ 295 ( £199 )