Glypth TM (image) DOE/Pacific Northwest National Laboratory Caption Avegant's Glyph™ is a headset display that has no screen. Instead, its visor contains a PNNL-developed virtual retinal display, which reflects light onto the back of the viewer's eyes. Credit PNNL Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.