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The eye and brain "edit out" the shadow lines of the capillaries, partially by dark adaptation of the photoreceptors lying beneath the capillaries. The white blood cells, which are larger than red blood cells, but much rarer and do not absorb blue light, create gaps in the blood column, and these gaps appear as bright dots.
Scintillating scotomas are most commonly caused by cortical spreading depression, a pattern of changes in the behavior of nerves in the brain during a migraine. Migraines, in turn, may be caused by genetic influences and hormones. People with migraines often self-report triggers for migraines involving stress or foods, [9] or bright lights. [10]
Visual snow does not depend on the effect of psychotropic substances on the brain. [13] Hallucinogen persisting perception disorder (HPPD), a condition caused by hallucinogenic drug use, is sometimes linked to visual snow, [ 26 ] but both the connection of visual snow to HPPD [ 8 ] and the cause and prevalence of HPPD are disputed. [ 9 ]
It is light-sensitive and communicates visual messages to the brain. If the retina detaches, it moves and shifts from its normal position. This can cause photopsia, but can also cause permanent vision loss. Medical attention is needed to prevent vision loss. Procedures may include laser treatment, freezing, or surgery.
Scientists have identified a biomarker for Alzheimer's that may help doctors spot the early signs of protein buildup in the brain before it causes significant damage. New test may detect Alzheimer ...
A few weeks back, NASA's Dawn probe beamed back pictures of Ceres, and astronomers were surprised to see two bright spots on the dwarf planet's surface. The picture lacked the detail necessary to ...
Hyperintensities appear as "bright signals" (bright areas) on an MRI image and the term "bright signal" is occasionally used as a synonym for a hyperintensity. Hyperintensities are commonly divided into 3 types depending on the region of the brain where they are found.
Many photos Monday managed to catch a bright spot at the bottom of the eclipse. Murphy explained people were probably witnessing a "post eruptive solar prominence," which was likely the location ...