Entoptic phenomenon
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Entoptic phenomena are visual effects whose source is within the human eye itself.
Purkinje tree depiction
Haidinger's brush
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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. Haiding
Entoptic phenomenon
…capillary, a space opens up in front of it and red blood cells pile up behind. This makes the dots of light appear slightly elongated with dark tails. Haidinger's brush is a very subtle bowtie or hourglass shaped pattern that is seen when viewing a field with a component of blue light that is plane or circularly…
Simulated appearance of a computer screen viewed through a polarizer, showing typical size and intensity of Haidinger's brush