Lid lag

{{Short description|Medical sign involving the human eyelid}}

Lid lag is the static situation in which the upper eyelid is higher than normal with the globe in downgaze.{{Cite journal|title = Lid lag and lagophthalmos: a clarification of terminology|last1 = Harvey|first1 = JT|date = 1981|journal = Ophthalmic Surg|last2 = Anderson|first2 = RL|issue = 5|volume = 12|pages = 338–40| pmid=7266976 }} It is most often a sign of thyroid eye disease, but may also occur with cicatricial changes to the eyelid or congenital ptosis. Lid lag differs from Von Graefe's sign in that the latter is a dynamic process. It can also be the manifestation of chemosis (swelling (or edema) of the conjunctiva).