What is the Black Hole effect in night field landings?

• A. Empty fields appear lower than actual; you descend
• B. Fields with lights cause reduced altitude awareness
• C. Eye fatigue causes misperception
• D. Empty fields appear open at night; you fly higher than your actual altitude

Answer: (D)

The main idea here is how night visual references—or the lack of them—distort depth perception. When you’re approaching a runway at night over a dark, featureless area, there are few cues to judge how high you are or how far away the runway is. That lack of horizon and ground references makes the scene look open and distant, so you tend to misjudge your altitude and glide path.

Because the field looks open and far away, you end up maintaining a higher altitude than you actually have. In other words, you think you’re closer to the ground than you are, or you think the runway is closer than it is, and you fly higher than the proper approach path. This is why this illusion is called the black hole effect.

Other options touch on related factors like lights influencing depth perception or eye fatigue affecting perception, but the specific characteristic of the black hole effect is the lack of visual cues in a dark, featureless area leading to the higher-than-actual-altitude perception during night landings.