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2. Closed-eye hallucination - Wikipedia

   en.wikipedia.org/wiki/Closed-eye_hallucination

   Learn about the different levels and types of closed-eye hallucinations (CEV), which are visual phenomena that occur when one's eyes are closed or in a darkened room. CEV can be induced by psychedelics, meditation, or sensory deprivation, and can range from simple noise to complex patterns and objects.

3. Entoptic phenomenon - Wikipedia

   en.wikipedia.org/wiki/Entoptic_phenomenon

   Blue field entoptic phenomenon is a visual effect caused by white blood cells moving in the capillaries in front of the retina. It appears as tiny bright dots moving rapidly along squiggly lines in the visual field and is more noticeable when viewed against a field of pure blue light.

4. Unihemispheric slow-wave sleep - Wikipedia

   en.wikipedia.org/wiki/Unihemispheric_slow-wave_sleep

   Unihemispheric slow-wave sleep (USWS) is a form of sleep where one half of the brain is in deep sleep while the other half remains alert. USWS has been observed in some terrestrial, aquatic and avian species, and is linked to the release of acetylcholine and eye opening.

5. Ganzfeld effect - Wikipedia

   en.wikipedia.org/wiki/Ganzfeld_effect

   The Ganzfeld effect is a phenomenon of perception caused by exposure to an unstructured, uniform stimulation field. It can result in hallucinations, altered states of mind, and parapsychological experiences. Learn about its history, mechanisms, and applications.

6. Visual release hallucinations - Wikipedia

   en.wikipedia.org/wiki/Visual_release_hallucinations

   Visual release hallucinations, also known as Charles Bonnet syndrome or CBS, are a type of psychophysical visual disturbance in which a person with partial or severe blindness experiences visual hallucinations. The web page explains the signs, symptoms, pathophysiology, diagnosis, and prognosis of CBS, but does not mention the ICD 10 code.

7. Scintillating scotoma - Wikipedia

   en.wikipedia.org/wiki/Scintillating_scotoma

   Scintillating scotoma is a visual aura that may precede a migraine headache, and is caused by cortical spreading depression. It can also occur without headache, and is sometimes called teichopsia, fortification spectrum, or flittering scotoma.