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″[Sleeping with contact lenses in your eyes] is bad. It’s real bad. Don’t do it,” Redfern told us, adding that this even applies to naps. “It’s like a game of Russian roulette.”
Learn about the different levels and types of closed-eye hallucinations (CEV), which are visual phenomena that occur when one's eyes are closed or in a darkened room. CEV can be induced by psychedelics, meditation, or sensory deprivation, and can range from simple noise to complex patterns and objects.
Scintillating scotoma is a common visual aura that may precede a migraine headache, but can also occur acephalgically. It causes flickering lights or zigzag patterns in the visual field, called fortification spectra or teichopsia, due to abnormal brain activity.
RBD is a sleep disorder in which people act out their dreams, often violently or injuriously. It is a symptom of synucleinopathies such as Parkinson's disease and dementia with Lewy bodies, and can be treated with melatonin or clonazepam.
The reflex acts to stabilize images on the retinas of the eye during head movement. Gaze is held steadily on a location by producing eye movements in the direction opposite that of head movement. For example, when the head moves to the right, the eyes move to the left, meaning the image a person sees stays the same even though the head has turned.
Blue field entoptic phenomenon is a visual effect caused by white blood cells moving in the capillaries in front of the retina. It appears as tiny bright dots moving rapidly along squiggly lines in the visual field and is more noticeable when viewed against a field of pure blue light.
Learn how blue light, a type of short-wave light in the violet / blue band, can affect circadian rhythm, retinal health, and sleep quality. Find out the sources, evidence, and controversies of blue light exposure and filtering.
Good news if you like to turn off your alarm on weekends and relish sleeping in: A new study suggests that catching up on sleep to make up for not getting enough shut-eye during the week may lower ...
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