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Perceptions of visual stimuli that are generated internally by the brain and are not based on any external sensory input. They can range from simple, unformed geometric shapes (photopsias) to complex scenes and people.
read more about visual hallucinations ...In ophthalmology, they are associated with severe visual loss, known as Charles Bonnet Syndrome (CBS). The brain creates its own visual input to compensate for the lack of real input (deafferentation).
Can also be caused by neurological conditions (e.g., epilepsy, stroke, migraine aura), psychiatric conditions, or certain medications.
Hallucinations are entirely fabricated perceptions. Illusions are misinterpretations of real external stimuli.
They are typically not scary or threatening, and the patient usually retains insight, meaning they know what they are seeing is not real.
Simple visual hallucinations of unformed shapes like flashes, sparks, or jagged lines, often caused by mechanical stimulation of the retina or vitreous traction.
Yes. The most common migraine aura is a complex, shimmering, zig-zag pattern of light called a scintillating scotoma.