We never got around to barking under this tree. Very Stealthy. Needed too peel a few more layers of the Onion. but there it is...

There was just a substantial number of challenges. If you look at all the disciplines needed to make a pair of AR glasses these days, you need not only optical mechanical engineers and optical designers, but you need people that understand eye glasses and people that understand the ergonomics of putting something on your head. You need advanced thermal simulation capability, high-speed signal analysis and modeling. It requires material science. It's very challenging, in that you need so many disciplines and competencies. And as it becomes more popular, there are customers that are just deciding for the first time that they would like to get into this, and so, for them especially, a reference design can help them get started.

http://smt.iconnect007.com/index.php/article/109508/a-not-so-surprising-focus-for-flex-in-the-xr-realm/109511/?skin=smt