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I'm not sure of the engish term but I think it's retinal persistence. the problem is that the eye has not the same refresh rate on all it's surface. I got sensitive eyes and that's why I'm very picky about refresh rates. i need 80Hz to feel comfortable when looking at the screen. any lower i can see it flash.
Wachler says that people usually blink around 18 times per minute, which refreshes the eyes naturally. But blink rates are reduced when staring at a computer screen or other digital device, and this can make your eyes burn, dry out, turn red or feel itchy. Sitting too close to your computer monitor, or holding a digital device closer to your eyes than you would normally hold a book or newspaper, also poses a problem, according to Wachler.