This phenomenon is caused by staring at a single point of light against a dark background for more than a few seconds, causing the light to appear to move on its own:

• A. Autokinesis
• B. Persistance of vision
• C. Visual drift
• D. Aiming error

Answer: (A)

Autokinesis is the phenomenon described. When you fixate on a single light against a dark background for several seconds, your eye makes tiny, involuntary movements and, with few surrounding visual references, the image on the retina can seem to drift. The brain interprets that retinal motion as the light moving, even though it isn’t. In flight, this illusion can be avoided by not staring at one light—scan the area, use horizon or other references, and let your eyes move to keep the scene anchored. Persistence of vision involves lingering afterimages, not a moving light; visual drift is a general term for normal eye drift affecting perception, and aiming error refers to misalignment when aiming, not this specific illusion.