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In visual perception, flicker is a human-visible change in luminance of an illuminated surface or light source which can be due to fluctuations of the light source itself, or due to external causes such as due to rapid fluctuations in the voltage of the power supply (power-line flicker) or incompatibility with an external dimmer.
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.
The flicker of a CRT monitor can cause various symptoms in those sensitive to it such as eye strain, headaches [9] in migraine sufferers, and seizures in epileptics. [10]As the flicker is most clearly seen at the edge of our vision there is no obvious risk in using a CRT, but prolonged use can cause a sort of retinal shock where the flickering is seen even when looking away from the monitor.
According to Microsoft, decreasing the disc rotation would cause games to take excessive amounts of time to load from the disc, and adding a bumper in the disc tray would cost 25 cents per console—a total of about 11 million dollars and causing a delay of the Xbox 360 release.
Hot flashes are episodes of intense heat that are often accompanied by sweating and flushing, Thurston explains. "They typically last a couple minutes, and occur randomly throughout the day and ...
A General Electric NE-34 glow lamp, manufactured circa 1930. Neon was discovered in 1898 by William Ramsay and Morris Travers.The characteristic, brilliant red color that is emitted by gaseous neon when excited electrically was noted immediately; Travers later wrote, "the blaze of crimson light from the tube told its own story and was a sight to dwell upon and never forget."
This minuscule change in time means we might need to consider a negative leap second.
Hot flashes, night sweats, and heat sensitivity can be a sign of hyperthyroidism, hormonal changes, or menopause. Here, experts share potential causes.