Blindness
Blindness is a status effect that reduces a player's vision. Blindness reduces the distance a player can see, potentially making them more vulnerable to mobs. This Status Effect only affects a player's vision. The Sun and Moon will still be visible. When combined with a Potion of Night Vision, a player will see everything in a sheet of fog that fades away when the condition dissipates. This trick can be used to create foggy "scenes" in a player's world. The player will also not be able to sprint.
Like all status effects, it can be removed by drinking Milk.