Getting past the awkward first week, I tried settling into life in bifocals. Being somewhat unsteady on my feet, I’m someone ...

Researchers have developed a new type of bifocal lens that offers a simple way to achieve two foci (or spots) with ...

Left and right Diagram showing how left circularly polarized (LCP) light is converted by the bifocal lens into separated beams of LCP light and right circularly polarized (RCP) light. (Courtesy: Fan ...