Are you talking about feather lashes? Or just regular feathers being attached some how to the eye?
With either, I would recommend lash glue. DUO lash adhesive. It comes in Black, White (Dries clear, and what I use for lashes and embellishments) and they also have a clear glue. But it’s awesome, and safe not only for your delicate eye lids, but for your face if you want to put rhinestones or whatever. Good luck! I wanna see what you do with it! Sounds fun!