The<unk>  is an<unk><unk>  characterized by the appearance of tiny bright dots (nicknamed<unk> -sky sprites) moving quickly along squiggly lines in the visual<unk> , especially when looking into bright<unk>  light such as the sky. The dots are short-lived, visible for a second or less, and traveling short distances along seemingly random, curvy paths. Some of them follow the same path as predecessors. The dots may be elongated along the path like tiny worms. The speed of the dots varies in sync with the pulse; they briefly accelerate at each heartbeat. The dots appear in the central<unk>  of view, within 15 degrees from the fixation point. The left and right eye see different dots; someone looking with both eyes sees a mixture. Most people are able to see this<unk>  in the sky, although it is rather weak, and many people do not notice it until asked to pay attention. The dots are highly conspicuous against a monochromatic<unk>  background (~430 nm) instead of the sky. The<unk>  is also known as Scheerer's<unk>  after the German ophthalmologist Richard Scheerer, who first drew clinical attention to it in 1924.
Blue field entoptic phenomenon
Entoptic phenomenon
Frontal release sign
Inverted binocular phenomenon
Argyll Robertson pupil
Hutchinson's pupil
Spatial hearing loss
Auditory exclusion