Originally Posted by AniMeFaN
Here are 2 panels of Danzo using Shisuis eye, Shisui Doryuku is used but its not clear what exactly was done. It appears like it could be some type of space time ninjutsu.
"Doryuku" means "eye power". Tobi was referring to Danzo deciding whether or not he wants to use Kotoamatsukami or Izanagi. Hence the part of "use it as a genjutsu or throw it away like Izanagi".