Lasers have been used routinely to measure the eye for the last 20 years. And everyone making that technology probably toyed with the idea of making a display r

Lasers have been used routinely to measure the eye for the last 20 years. And everyone making that technology probably toyed with the idea of making a display rather than a sensor because you deal with the same issues. My guess is it has been prophetic patents holding progress back, so hopefully they are starting to expire now.