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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.
The eye behaves differently in high or low light conditions: in daylight, for brightness levels above 3 cd/m 2 the vision is mainly done by the centre of the retina, we can see colors and the maximum sensitivity is at 555 nm (in the green region). This type of vision is called photopic vision. In low light conditions, for brightness levels below 30 Î¼cd/m 2, the vision is mainly done by the peripheral region of the retina which is color-blind, while the centre region is not sensitive enough to see any color. This type of vision is called scotopic vision.