enophthalmos

{{Short description|Sinking of the eyeball into its socket}}

{{distinguish|enophthalmia}}

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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.{{Citation |last=Soparker |first=Charles N.S. |title=ENOPHTHALMOS 376.50 |date=2008 |url=http://dx.doi.org/10.1016/b978-1-4160-2447-7.50325-x |work=Roy and Fraunfelder's Current Ocular Therapy |pages=593–594 |publisher=Elsevier |access-date=2022-08-26}}

It should not be confused with its opposite, exophthalmos, which is the anterior displacement of the eye.

It may be a congenital anomaly, or be acquired as a result of trauma (such as in a blowout fracture of the orbit), Horner's syndrome (apparent enophthalmos due to ptosis), Marfan syndrome, Duane's syndrome, silent sinus syndrome or phthisis bulbi.{{cn|date=June 2022}}