surveillance vision block

night-vision goggles (NVGs); night vision goggles (NVG)

NV (night vision) mount, NVG (Night Vision Goggles) mount

NV kit, NVG kit / Night Vision, Night Vision Goggles

all-round vision block

direct vision block

vision block

surveillance by natural vision

cylinder block (engine block)

feed block slide (feed-block-actuating slide)

surveillance, high- and low-altitude surveillance

surveillance, under surveillance

field of vision

infrared night vision observation device

night (vision) sight

night vision device (NVD)

night vision kit

night vision sight

obscurant agent (vision-restricting agent)

Starlight Scope (Night Vision Sight)

vision nil (zero)

night-vision flip-up goggles

all-around vision

binocular vision

vision slit

video-frequency (vision) channel

vision

vision aid

vision slot

night vision

night vision device

night vision glasses

night vision training