Board Thread:General Discussion/@comment-25814498-20150505201606/@comment-25814498-20170301190732

They could be under a constant state of Gyo whilst he has them on for one, and they could enhance his already superb sight even further. Or perhaps there could be an ability where they highlight things that would be of interest to the user whilst they are on and be blind to almost everything else; so they could be used to track footprints if the user were a magical beast hunter or poacher hunter and make Nen users using Zetsu to track them extremely visible against their environment.