Illopsias, also known as illusory perceptions, refers to a condition where an individual experiences distorted perceptions of reality, such as seeing objects that are not present or misinterpreting the appearance of real objects. This phenomenon can occur in various contexts, including neurological disorders, psychiatric conditions, or as a side effect of certain medications. It is important to differentiate illopsias from other perceptual disturbances, such as hallucinations, which involve perceiving non-existent stimuli without an external source. Treatment often involves addressing the underlying cause and may include therapy or medication adjustments.