A variety of devices, using (passive) image intensifiers (intensification of residual light) and/or thermal (infrared) imagers to improve observation, target acquisition or aiming in low light conditions; they can be coupled with (active) laser aiming lights (laser illuminators or designators, target markers, spot projectors); they take the form of hand-held or helmet-mounted binocular and monocular goggles, pocket scopes, rifle-mounted weapon sights, or armored vehicle periscopes.