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What is the difference between an illusion and a hallucination?

Dr. Michael Roizen, MD
Internal Medicine
An illusion is simply a misinterpretation of data that the brain is receiving—perhaps caused by light being refracted in an odd way. A hallucination, on the other hand, isn't based on any kind of reality. As an example, people with cataracts tend to see illusions, hallucinations.
You: Staying Young: The Owner's Manual for Extending Your Warranty

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You: Staying Young: The Owner's Manual for Extending Your Warranty

International bestselling authors of YOU: The Owner's Manual and YOU: On a Diet give you all the tools and know-how to stay young and defy the ageing process. Drawing lively parallels between your...

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.