dumbbell phosphene

dumbbell phosphene:    Also known as dumbbell-shaped phosphene. Both terms are used to denote a type of " phosphene (i.e. 'seeing stars') that may arise after sustained convergence of the eyes, especially with closed eyes against an illuminated background. The name dumbbell phosphene refers to the typical dumbbell shape of these phenomena, extending horizontally from the region of the fovea to the periphery. Dumbbell phosphenes are classified as a variant of the "convergence phosphene, which is in turn classified as an "entoptic phenomenon or a "physiological illusion. The term dumbbell phosphene is used in opposition to the term "fiery rings of Purkinje.

   References

   Tyler, C.W. (1978). Some new entoptic phenomena. Vision Research, 18, 1633-1639.

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convergence phosphene — A term used to denote a *phosphene (i.e. seeing stars ) arising physiologically in association with convergence of the eyes. In 1978 the American neuroscientist Christopher W. Tyler proposed a distinction between two types of convergence… … Dictionary of Hallucinations
fiery rings of Purkinje — The eponym fiery rings of Purkinje refers to the Bohemian physiologist Johannes Evangelista Purkyne (1787 1869), who is credited with being the first to describe the concomitant phenomenon in his textbook of 1823. The phenomenon consists of… … Dictionary of Hallucinations

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