A visual fallacy is an error in perception or judgment that occurs in the visual sense. It can happen when our eyes perceive something that is not really there or when we come to false conclusions based on what we see. Some synonyms for visual fallacy include optical illusion, perceptual error, visual distortion, and sight deception. Optical illusion is a popular term used to describe a visual phenomenon that deceives the eye. Perceptual error refers to a misperception or misinterpretation of visual information. Visual distortion is another term used to describe a situation where the eye sees something that is not really there, and sight deception refers to a situation where the eyes are misled in their observations.