Which perceptual effect is associated with night vision goggles?

• A. A lack of depth perception
• B. 3D effect of distant objects
• C. Blinding light when entering a well-lit environment
• D. A shimmering beach on the horizon

Answer: (A)

Night vision goggles produce a two-dimensional image of the scene, so depth information is not conveyed in the same way as with natural vision. Depth perception relies heavily on binocular cues and a variety of depth cues in a three-dimensional world, but the intensified image seen through NVGs is effectively flat. Because the brain isn’t getting the usual depth signals, distance to objects and terrain is harder to judge, especially at night. Pilots must rely more on motion cues, known terrain features, and instrument references to gauge distance. The other options don’t reflect the typical perceptual effect of NVGs: they don’t inherently create a true 3D effect, transitioning to bright light can cause temporary glare or adaptation issues but isn’t the defining perceptual change, and horizon shimmer is usually due to atmospheric conditions, not a hallmark of NVG perception.