The purpose of the present invention is to provide an annular device that can address the various problems which arise when conventional annular rings are worn, and that, when worn, exhibits on-eye stability that is superior to that of conventional art. The annular device that addresses said purpose is for wear on the sclera surface and is characterized by: the inclusion of an opening that exposes the cornea； the inclusion of one or a plurality of approximately circumferential grooves on the rear surface of an intermediate section that is between an inner edge and an outer edge； and, preferably, the intermediate section having the maximum thickness.
