Is this normal?

In the light I see a very faint pixel/ grain filter over everything, and in the nighttime I have very intense pixels and some of them flash, and when I look at something for a while my vision goes green and a black spot appears. I have perfect vision and i don’t know if this is normal because everyone I asked said they don’t see anything! I couldn’t find anything in this online so it probably is normal but I still have no idea 😢