Why do i have a blue ring around my dark brown eyes?

Ring around eye: this is probably an Arcus. It appears to surround the colored part of the eye.It's actually in the cornea.It is usually gray color,but may appear bluish.It is perfectly benign. In a younger person it is a good idea to have a cholesterol test,since it is fatty degeneration.Sometimes it is familial.It does not effect vision or cause any ocular problems.