Enophthalmos is a posterior displacement of the eyeball within the orbit. It is due to either enlargement of the bony orbit and/or reduction of the orbital content, this in relation to each other.
It should not be confused with its opposite, exophthalmos, which is the anterior displacement of the eye.
In medicine, enophthalmia describes eyes that are abnormally sunken into their sockets. This condition usually affects elderly persons. Surgery can be done to correct it. Bilateral progressive enophthalmos may be the presenting sign of metastatic breast carcinoma, even when local symptoms in the breast are absent.