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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.
Or when you have a visual field of 20 degrees or less. (Your eye doctor may call this tunnel vision.) Low vision: When youâre either legally blind (you have a visual acuity of less than 20/200 or tunnel vision) or have visual acuity between 20/70 and 20/200, despite the use of glasses or contacts.