http://www.techradar.com/news/rainbows-in-your-eyes-harvard-team-creates-a-lens-that-could-revolutionize-vr

A team of very bright scientists working out of Harvard University's John A. Paulson School of Engineering and Applied Sciences have created a single 'metalens' that is capable of focusing the entire spectrum of visible light (including white light) into a single point.

This could be revolutionary for the world of VR, as this lens would theoretically mean a headset would be able to house a thin, relatively inexpensive display that is able to (in high resolution) use the full range of color we see in the natural world.