Aviation Medicine (AvMed) Practice Test 2025 - Free Aviation Medicine Practice Questions and Study Guide

Night Vision Goggles (NVGs) are designed to enhance vision in low-light conditions by amplifying available light. They primarily operate within the visible light spectrum and extend into the near-infrared range. This capability allows NVGs to utilize the minimal light present at night, including starlight and moonlight, to produce a clearer image for the wearer.

The visible spectrum encompasses the light that the human eye can naturally detect, while the near-infrared region includes wavelengths just beyond what our eyes can see, which are often emitted by various objects and are present even in low-light conditions. This combination allows NVGs to be effective not only under very dim light conditions but also when there are infrared illuminators present.

Consequently, the correct understanding is that NVGs utilize both the visible and near-infrared parts of the electromagnetic spectrum, maximizing their effectiveness for nighttime or low-light operations.