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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.
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.
The book was also adapted in 1977 as the episode "The Flickering Torch Mystery" for the 1977 Hardy Boys/Nancy Drew Mysteries TV series. The story was completely re-written, involving the Hardys' search for a missing sound engineer in an investigation that uncovers a plot to kill rock star Tony Eagle (played by Ricky Nelson). Unfortunately, they ...