The problem with most of the current projects of smart
glasses is the usage of a small semitransparent HUD display,
which does not cover the entire eye-field, but only a tiny
fraction, and thus will interfere and distract. When using the
small display, the question is to what extent these devices still
applicable with regard to potential security risks (inattention),
good ergonomics, durability or potential health risks
(headache).