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  2. Closed-eye hallucination - Wikipedia

    en.wikipedia.org/wiki/Closed-eye_hallucination

    Closed-eye hallucinations and closed-eye visualizations (CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes , perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause stimulates the eye.

  3. Visual release hallucinations - Wikipedia

    en.wikipedia.org/wiki/Visual_release_hallucinations

    Visual release hallucinations, ... A related type of hallucination that also occurs with lack of visual input is the closed-eye hallucination. Signs and symptoms

  4. Entoptic phenomenon - Wikipedia

    en.wikipedia.org/wiki/Entoptic_phenomenon

    A phosphene is the perception of light without light actually entering the eye, for instance caused by pressure applied to the closed eyes. A phenomenon that could be entoptical if the eyelashes are considered to be part of the eye is seeing light diffracted through the eyelashes.

  5. Phosphene - Wikipedia

    en.wikipedia.org/wiki/Phosphene

    Closed-eye hallucination – Class of hallucination; Dark retreat – Tibetan Buddhism advanced practice; Isolation tank – Pitch-black, light-proof, soundproof environment heated to the same temperature as the skin; Prisoner's cinema – Visual phenomenon involving seeing animated lights in the darkness

  6. Ganzfeld effect - Wikipedia

    en.wikipedia.org/wiki/Ganzfeld_effect

    The visual effect is described as the loss of vision as the brain cuts off the unchanging signal from the eyes. The result is "seeing black", [ citation needed ] an apparent sense of blindness. A flickering ganzfeld causes geometrical patterns and colors to appear, and this is the working principle for mind machines and the dream machine .

  7. Positive visual phenomena - Wikipedia

    en.wikipedia.org/wiki/Positive_visual_phenomena

    It is only delusion that has serious psychiatric implications. The content of hallucinations is widely variable and can range from simple images including flashing or steady spots, colored lines and shapes (unformed hallucinations) to vivid objects, flowers, animals and persons (formed hallucinations).

  8. Blue field entoptic phenomenon - Wikipedia

    en.wikipedia.org/wiki/Blue_field_entoptic_phenomenon

    The left and right eye see different, seemingly random, dot patterns; a person viewing through both eyes sees a combination of both left and right visual field disturbances. While seeing the phenomenon, lightly pressing inward on the sides of the eyeballs at the lateral canthus causes the movement to stop being fluid and the dots to move only ...

  9. Haidinger's brush - Wikipedia

    en.wikipedia.org/wiki/Haidinger's_brush

    Haidinger's brush, more commonly known as Haidinger's brushes is an image produced by the eye, an entoptic phenomenon, first described by Austrian physicist Wilhelm Karl von Haidinger in 1844. Haidinger saw it when he looked through various minerals that polarized light. [1] [2] Many people are able to perceive polarization of light. [3]