By Evan Kestenbaum, MBA, and Valerie Manso, dba contributors
Tuesday, December 2, 2014 12:48 PM
As digital device usage soars, the resulting digital eyestrain and exposure to damaging blue light has created a new product category for regional optical retailing groups—blue light lenses. As of January 2014, 90 percent of American adults had a cell phone, 58 percent had a smartphone, 32 percent owned an e-reader, and 42 percent owned a tablet computer, according to the Pew Internet Projects mobile technology research.