The invention relates to a one-piece adaptor device for the ocular instillation of ophthalmic drops from a container, consisting of: an elongate adjustment body for receiving a single-dose container of ophthalmic fluid, with at least one means for holding the container； a support extension ending in an ergonomic distal end, designed to be supported on a lower area of the eyelid； and at least one projection on the adjustment body for pressing the container and helping to the squeeze out the ophthalmic fluid.
