Narbis glasses have dry sensors to monitor a wearer 's brainwaves . Lenses will detect if the system detects a user has lost focus on a device . When they start gaining attention again , the lenses will clear . to improve vision , sleep and stress levels , inventor claims . Glasses system can be re - installed on Kickstarter from $ 295 ( £ 199 )
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 )