system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do humans see vague lights better in dark environments as long as they're not looking directly at the light source?

Sometimes in a dark room, when people see just a tiny bit of light, like the glowing dot from a charger, we're able to see the light just as long as we're not looking directly at it. Why is this?
gpt
To keep this answer very ELI5, the centre of your vision is filled with things called cones. These detect colour, and are densely packed to pick up detail, but they are not very light sensitive. The rest of your vision is made up of things called rods, these don't detect colour, but they are sensitive to light.

To be a little more in depth, your vision is made up of things called receptive fields. Each rod or cone is grouped together into these fields. At the centre of your vision these fields are small, so you can detect detail. At the edge of your vision they are larger. These larger fields get hit with more light (simple by virtue of being larger) and respond stronger to low light conditions.