Health Effects
The constant refreshing of a CRT monitor can cause various symptoms in those sensitive to it such as headaches in migraine sufferers and seizures in epileptics, if they are photosensitive. Screen filters are available to reduce these effects. A high refresh rate (above 75 Hz) also helps to negate these particular effects. Frequent users of TFT monitors usually are more sensitive to the low refresh rate of CRT monitors as the light behind a TFT monitor (backlight) usually is driven at 40–50 kHz, which is unnoticeable to the human eye.
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. This can create a sort of motion sickness, a discrepancy between the movement detected by the fluid in the inner ear and the motion we can see. Symptoms include dizziness, fatigue, headaches and (sometimes extreme) nausea. The symptoms usually disappear in less than a week without CRT use, and usually only last a few hours unless the exposure has been over a long period.
Health effects specific to FLKR FRAME VIDEO include some reports or seizures, but due to the small pixel sized video adjustment, no accurate example of this actually happening has been found. Reports of this come from anecdotal stories from email and the internet.
Read more about this topic: Flicker (screen)
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