For example, when I walk through my dark room at night I can see my path (avoiding furniture etc.) more clearly when I only use my peripheral vision.
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Rods and cones.
Rods are better in low light but don’t see color. They are more dispersed.
Cones require more light but see color, and can cause blind spots when they fatigue.
When you look away slightly, you are refreshing the blind spots with less sensitive cones.
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