system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why your vision becomes grainy when you're in a dark room or when you close your eyes

Repost since my post got ''[removed]'' when I did not remove it myself nor did I receive a message as to why so I am going to assume it was a glitch on Reddit.

Like tiny fine dots that change colors and are red green and blue.
gpt
Our eyes have two different types of cells that detect light.  Rods and Cones.  

Cones detect color, there are (usually) three types that detect different wavelengths, corresponding to Red, Green, & Blue.   

Rods don't detect color, only amount of light.

Cones have a much harder time detecting light when the light levels are very low.   This is why we tend to lose our color vision when in low light.   The cones practically stop working but the rods still work.

I don't recall fine dots that change colors, but I'd bet that what you are asking about is because the cone cells are struggling while the rod cells make up the difference.