Not to scare you but there are cancers of the eye that cats can get.
Please read the whole thread found at the link below....http://www.thecatsite.com/forums/sho...ght=eye+cancer
I think that it is critical you have Miley's eye checked by your vet to rule out anything serious. If the spot is OK, at least your vet will have a baseline exam of the spot to compare during later checkups.
I would not delay on this.