AN/PVS-2
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The AN/PVS-2 is a first generation night vision scope, utilising a cascaded image intensifier. The lenses of the device are thoriated.[1]
IWS (Weapon-Sight, Image Intensified)
The IWS is the British analogue to the US AN/PVS2. It uses a different objective lens and could be mounted to a variety of weapons, including the L1A1 SLR and Enfield L42A1. Later models made use of the more advanced P8079HP tube.
Further Reading
A deep dive by YouTube channel "Our Own Devices":
AN/PVS-2 Starlight Scope: Night Vision Comes of Age
