system
Given the following post, respond as if you're commenting on Reddit:
human
Why can I see my LED lightbulbs flicker when I see them in my periphery, but not directly?
gpt
The critical flicker frequency, as in what ~~higher~~ lower threshold frequency something must flicker for the eye to detect it, is not the same over the whole retina. The peripheral retina tends to be able to detect higher frequency flickering than the central parts of the retina because the outer parts of the retina has a higher proportion of the light sensitive rods (as opposed to color cones) than the central retina and that makes it better at detecting changes in light intensity.