I thought they had solved this. "Such may be used to cancel light from the planar waveguides with respect to light from the background or real world, in some respects similar to noise canceling headphones." from https://gpuofthebrain.com/blog/2016/7/22/how-magic-leap-will...
I think you have to take those demo videos with a pinch of salt. It's impossible to demo tech like this without wearing the device. Assumedly the field of view is inaccurate as well. What's interesting is that it's a 'light field' and not just a screen, hopefully opening up areas of innovation. Let's see how it pans out once more details are revealed.
