iOptik is not alone in the burgeoning field of augmented-reality devices. Other companies, including Google, have AR systems in development, but those displays are far heavier or have a much smaller visual field. Sprague says his invention will be ready for FDA testing by the spring of 2014, and he is currently in talks with electronics companies interested in licensing it. Innovega recently received funding from Darpa, the Pentagon's R&D arm, which plans to use iOptik as part of a project aimed at equipping troops with "super vision." Using iOptik lenses, soldiers could, for example, call up an overhead map of a battlefield while at the same time seeing the real thing right in front of them.