Korean researchers shrink augmented reality lenses to fit everyday eyewear

Researchers in Korea have developed an ultrathin optical lens system that keeps digital images bright and legible even in direct sunlight, overcoming one of the main engineering hurdles preventing augmented reality glasses from looking and feeling like ordinary eyewear. The joint team from Pohang University of Science and Technology (POSTECH) and Samsung Research built a prototype featuring a 1.5-millimeter-thick waveguide—the transparent channel that guides light from a tiny projector into the wearer’s eye—using engineered nanostructures called metasurfaces. The findings were published Thursday in the journal Nature, according to the Ministry of Science and ICT. For years, technology giants from Meta and Apple to Google and Samsung have raced to build lightweight smart glasses capable of overlaying turn-by-turn directions, translations and messages onto the real world. However, engineers have struggled with a stubborn trade-off: widening the viewing zone so a user can glance around without losing the image typically causes light to scatter and leak out of the lens, leaving displ