Which phenomenon during landing is defined as the brain's misinterpretation of ground features causing misread of spatial relationships?

• A. Otolith organ
• B. Orientation
• C. Optical illusion
• D. Obstruction lights

Answer: (C)

Visual perception during landing can be deceived by optical illusions, where the brain misreads the relationship between the aircraft and the ground based on what is seen. As you approach, you rely on visual cues like runway width, edge lights, perspective, and surrounding terrain to judge height, distance, and angle. When those cues are misleading—for instance, a runway that looks too long or too short, uniform textures, or lighting patterns at night—the brain can misinterpret how high you are or how steep your approach path is, leading to an incorrect pitch or glide path. This phenomenon is specifically about how vision creates illusions that alter spatial judgments on final approach. The otolith organ is part of the inner ear and relates to balance and linear acceleration rather than misreading ground features, orientation is a broader term for awareness of position and direction, and obstruction lights are simply safety lighting, not perceptual effects.