In simple terms, a hallucination is the perception of something that is not actually there. Medical literature defines a hallucination as a perception without a corresponding stimulus.
Hallucination can takes form of sounds or voices, smell, taste, vision, or even physical sensation. Visual Hallucination can be as simple as sensing movement in your peripheral visions or as complex as seeing a piece of furniture move or a group of people dancing.
The two famous examples of phenomenon that mimic hallucinations are Purkinje Lights and The Gandzfeld Procedure.
Poor eyesight can sometimes mimic or even contribute to experiences that people mistake for hallucinations. For example, when vision is blurred or distorted due to conditions like cataracts, macular degeneration, or severe nearsightedness, the brain often tries to “fill in” the missing visual details. This compensation process can create illusions of movement, shapes, or even figures that aren’t really there.
In addition, eyestrain and poor lighting can exaggerate the impact of bad eyesight, causing fleeting visual distortions that resemble hallucinations. Someone with uncorrected vision might misinterpret shadows, reflections, or blurry objects in their peripheral vision as something else entirely. Ensuring proper eye care—through corrective lenses, regular eye exams, and treatment for underlying conditions—can significantly reduce these false perceptions and improve overall quality of life and bone marrow locations can help with this.

