Asklemmy

Changing the FPS would not change your exposure. Changing the shutter angle/speed would. So does changing the aperture. We don’t have shutter speed in our eyes, but we do have an iris! Your eyes actually change your iris aperture naturally when in the dark.

You can even trick your body to change the iris on only one eye. Cover one eye for a few minutes (at least 15-20min) in a brightly lit environment then move to a rack room (not pitch black but very minimal light) and open your covered eye. Your covered eye’s iris is already wide open and you can see well from it. The other one needs time to adjust.

This is why pirates were wearing eye patches, to be able to enter the hull of the ship and see immediately without lighting up a candle. Fire is not a good idea inside a wooden ship filled with black powder.

Eyes don't really have a concept of FPS because we don't have shutters in the first place. The brain is just continuously interpreting what we see. And it fills in a lot of gaps: for example, we technically have a large blind spot right in the middle of the retina, and that's why we're more sensitive to movement in our side vision.

Cats see just fine in the dark, our eyes are just not sensitive enough to low light to be all that useful for us, but we could, if the eyes provided that input. Evolution just made it so we favored speedy and sharp vision in daylight rather than night vision, in part because we quickly developed technology (fire) to keep our areas lit as needed.

They do. The eye doesn't have "frames per second", per se, because every neuron acts independently, instead of as a eye-wide "frame". But the rod cells that your eye switches to for night vision have slower activation time than the cone cells, allowing them more time to capture photons, before telling the brain about what it saw. Just like how your camera switches to longer shutter times for night vision to capture more photons, before sending them to the SD card.

Rod cells also respond more slowly to light than cones and the stimuli they receive are added over roughly 100 milliseconds. While this makes rods more sensitive to smaller amounts of light, it also means that their ability to sense temporal changes, such as quickly changing images, is less accurate than that of cones.

https://en.wikipedia.org/wiki/Rod_cell#Sensitivity

Eyes/the brain don't have frames.

The way cameras work is that they expose multiple frames to create a series of still images. The slower those frames are going, the longer they are exposed to the ambient light, thus why lower FPS allows for better picture quality in low light environments.

The way to do this with vision would be to allow more light in to your eyes than normal. Larger eyes, more dilation, more rods in your eyes, and other adaptations could improve your night vision abilities. Your best bet is to look at nocturnal animals and understand how their vision is better than ours in the dark.