The augmented reality future we’ve all been dreaming of is still years away. I’m not here to debate that. But the hardware and software that currently exists has continued to improve. Early adopters are already enjoying lightweight glasses with sharp, bright displays, and some recent products demonstrate the progress made on that long path to AR glory. I wanted to take stock of the current generation of smart glasses technology, complete with three different approaches. One is a stylish, fitness-focused pair of glasses that provides health-tracking data and directions at a glance. Another is all about entertainment and productivity, made...