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A large proportion of those with CBS develop the visual hallucinations as vision begins to deteriorate and stop hallucinating once vision is entirely gone. [10] Complex hallucinations may progress over time if the primary loss of vision is due to damage of the early cortical areas. [ 10 ]
The content of hallucinations varies as well. Preliminary research has found that most individuals had multiple types of visual hallucinations. [20] Scenes involving people and/or animals were the most common, followed by simple geometric images. [4] Complex (formed) visual hallucinations are more common than Simple (non-formed) visual ...
It most commonly occurs in people over the age of fifty and in the United States is the most common cause of vision loss in this age group. [ 1 ] [ 3 ] About 0.4% of people between 50 and 60 have the disease, while it occurs in 0.7% of people 60 to 70, 2.3% of those 70 to 80, and nearly 12% of people over 80 years old.
Palinopsia (Greek: palin for "again" and opsia for "seeing") is the persistent recurrence of a visual image after the stimulus has been removed. [1] Palinopsia is not a diagnosis; it is a diverse group of pathological visual symptoms with a wide variety of causes. Visual perseveration is synonymous with palinopsia. [dubious – discuss]
About 30% of patients report visual hallucinations of the removed eye. [1] Most of these hallucinations consist of basic perceptions (shapes, colors). In contrast, visual hallucinations caused by severe visual loss without removal of the eye itself (Charles Bonnet syndrome) are less frequent (prevalence 10%) and often consist of detailed images.
Visual auras can be simple or complex. Simple visual symptoms can include static, flashing, or moving lights/shapes/colors caused mostly by abnormal activity in the primary visual cortex. Complex visual auras can include people, scenes, and objects which results from stimulation of the temporo-occipital junction and is lateralized to one hemifield.