What is the primary reason for using green phosphor in NVGs?

The primary reason for using green phosphor in night vision goggles is that green light is easier for the human eye to detect and differentiate in low-light conditions. Human vision is particularly sensitive to green wavelengths, which fall within the range of 520–570 nanometers. This sensitivity allows for better clarity and contrast when viewing images in the dark. In low-light environments, the eye can perceive variations in shades of green more effectively than other colors, making it ideal for night vision applications.

Additionally, using green phosphor enables operators to see a more detailed image and better distinguish between various objects and depths in their environment. This characteristic is critical for tasks that require depth perception and situational awareness in dark conditions, making green phosphor a preferred choice for NVGs. While the other options touch on various aspects of visual perception or device performance, they do not capture the specific advantage of green light’s visibility in low-light scenarios as effectively as the correct choice does.