Which effect is specifically described as an effect of night vision goggles on depth perception beyond the basic lack of depth?

• A. A 3D effect of distant objects
• B. Lack of depth perception
• C. Blinding light when transitioning to bright light
• D. A shimmering horizon effect

Answer: (A)

The main idea is how night vision goggles alter depth cues in night flight. While it’s true that using NVGs reduces normal depth perception compared to daylight, pilots often notice an additional effect: distant objects can take on a distinct three-dimensional, relief-like appearance. This “3D effect” arises because the intensified image enhances contrast and edge definition, making ridges, contours, and distant terrain stand out more clearly. That enhanced, pseudo-3D impression goes beyond the basic lack of depth and can influence how depth is judged at a distance.

So, the best choice isn’t just that depth perception is generally reduced, but that there is this specific 3D-like perception of distant objects caused by the NVG image, which is the described extra depth cue. The other options describe either the baseline issue (lacking depth) or unrelated NVG effects (glare during bright transitions or horizon shimmer) that don’t pertain to how depth is perceived beyond the general reduction.