Producers of hi-tech connected eyewear are multiplying their innovations with increasingly discreet models in an attempt to make a difference in a highly competitive—and fast-emerging—market.

Producers of hi-tech connected eyewear are multiplying their innovations with increasingly discreet models in an attempt to make a difference in a highly competitive -- and fast-emerging -- market. Today's smart glasses, all paired with smartphone apps, increasingly resemble traditional eyewear.

Producers of hi-tech connected eyewear are multiplying their innovations with increasingly discreet models in an attempt to make a difference in a highly competitive -- and fast-emerging -- market. Today's smart glasses, all paired with smartphone apps, increasingly resemble traditional eyewear.