The nVisor ST is similar to the nVisor SX but offers see-trough capabilities.
 

The new nVisor ST is a high-resolution see-through head-mounted display designed for augmented
reality applications requiring a wide field-of-view format with superior SXGA image quality.
High efficiency optics incorporating reflective-transmissive polarizers increase light-throughput,
presenting a high-contrast virtual image while allowing 50% light transmission from the environment.

Learn more about the nVis nVisor ST50 in the download section: