|Category:||Head-Mounted Equipment [HMD/NVG/Glasses]|
|Year of Manufacture:||Unknown|
|Location:||Archive Object Store|
This is an early prismatic eyepiece design probably from around the 1980’s. It was steadily refined to provide an ejection-safe Night Vision Goggle integrated within a specially designed helmet and also for the early Helmet Mounted Displays. The prism allows a straight through view but also projects an image from a CRT to the pilot’s eye. This system was used on the I-NIGHTS HMD for the US Navy. These early prisms were quite heavy, being solid glass, and gave a very forward centre-of-gravity.