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.
There are two kinds of light-sensitive cells in the retina of your eye (the layer at the back of the eye): rods and cones. Cones are concentrated at the center, while rods are everywhere else. Cones detect color but are not as sensitive to light. Rods are better with low light but don’t detect color. Your peripheral vision is the rods.
Depends, what do you mean by blurry. Still, or moving? Like the other comments mention it’s about rods and cones. Cones are sharper, do colours but are only located at your precise point of focus; this is a very small area. Rods are everywhere, fast, don’t tire. If it’s blurry because of movement this will be because of faster rods. But also because were are designed to track; and speculate trajectory of predators and prey. Its often not so much sharper sight, but a prediction from our brains. We are also better at seeing things in motion. Looking at a static picture you’ll start to see interference. Peripheral vision is more prediction than actual seeing. We’re just quite good ad it
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