off topic but,how do sights work for people with bad vision?
I'm sure others can answer better than me and also sure that what kind of bad vision can play a big part.
Basically though, they are brighter sights in low light situations.
Fiber optic sights are little colored plastic solid tubes/rods that when looked at from the round flat end side sorta glow because the rest of the round sides of the rod kind of gathers the light and makes it a brighter colored dot to see.
Those aren't really night sites but do help in lower light. In my experience, they work better outside in lower light conditions than inside. I think it's because inside, the light is bouncing off the walls whereas outside in seemingly the same amount of lightness, the light is coming down from the sun. The fiber optic sights tend to be more open on the side facing the sun and more closed on the sides where a considerable amount of light is coming from being bounced off the walls.
Night sights like Tritium uses essentially a paint with radiation in it that glows. It doesn't need to be charged liked glow in the dark paint. It does however, weaken over time, as in years.
In my very limited experience, the white-ish color of tritiums is less bright than regular white painted sights (kind of slight yellowy/greenish tinge similar to what glow in the stuff looks like in the day light ) and I don't like that in regular light conditions which is when I do most shooting.
Both help you see the sights but neither really help seeing the target which is largely why people put flashlights on their gun.
I hope that helps a little. Welcome to THR.