Conventional 'straightthrough ' nightvision goggles are now in widespread service with many armed forces throughout
the world. Though originally designed for ground forces they have been successfully engineered into the airborne environment
and are used on both rotary wing and fixed wing aircraft. However, a major disadvantage in the use of this type
of NVG, particularly in fast jet applications, is that they obscure the pilots direct view of the Head Up Display.
The combiner eyepiece NVGs solves this problem by giving the pilot a direct view of the HUD and cockpit instruments
which is optically combined with the intensified image. The cockpit instruments and HUD are ofcourse compatible with
the NVG and are invisible to the NVG.
The development ofa Combiner eyepiece NVG from initial concept through to production isdiscussed including design
considerations, trade offs and enhancements to the operation of the device. The further development of the combiner
eyepiece NVG into a fully integrated ejection safe night vision helmet is also described.