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The flicker fusion threshold, also known as critical flicker frequency or flicker fusion rate, is the frequency at which a flickering light appears steady to the average human observer. It is a concept studied in vision science , more specifically in the psychophysics of visual perception .
"The Need for Speed". The New York Times. Winkler, Robert. "The Flicker Fusion Factor: Why we can't drive safely at high speed". Archived from the original on 2010-12-05, repost on author's personal website. {}: CS1 maint: postscript ; I get it, I know I'm inferior, November 9, 2006, Pharyngula – comments
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.
Newer fluorescent lights without magnetic ballasts have essentially eliminated flicker. [6] [7] Individuals with high flicker fusion threshold are particularly affected by these obsolete, electromagnetic ballasts: their EEG alpha waves are markedly attenuated and they perform office tasks with greater speed and decreased accuracy. [8]
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.
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The perceived difference is due to flicker fusion threshold, which is defined as the frequency that a flashing light appears "steady" to the human eye. For example, for a series of flashed still-pictures to appear steady, the frequency of flashing has to be at a rate greater than the flicker fusion threshold, which for humans is about 60 Hz ...
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