The £520 spectacles were described by the tech website Gizmodo as “the dumbest smart glasses”NARBIS It is a biblical curse: “All the bright lights of heaven will I make dark over thee.” Now a tech startup plans to apply the principle to children who will not focus on...

Narbis glasses have three sensors - one behind each ear and another on top of the head - that monitor a wearer's brainwaves The lenses will darken if the system detects a user has lost focus on a task  The specs are meant to improve concentration, sleep...