Night vision monoculars and Binoculars differ from their daylight counterparts in that they are used to see in the dark rather than at long distances. Depending on the size of the object and the amount of ambient light, Generation I units provide maximum image detection at 75-750 yards, Generation II at 100-100 yards, Generation III at 150-1250 yards, and Generation IV at 200-1400 yards. However, 10-100 feet is typically the maximum range for detecting image detail for average sized objects such as viewing wildlife.

All night vision optics require some light to work. However, many units include an infra-red illuminator to allow their use even in total darkness. Depending on the strength of that illuminator, detection may extend to 100 yards, allow the viewing range may be decreased by 50%.Technology does come at a price. For each generational advance, the cost increases by two or threefold. That's why Generation I night vision optics are still the most popular, allowing users to explore a previously undiscovered world.

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