Lid lag is the static situation in which the upper eyelid is higher than normal with the  globe in downgaze. 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 is characterized by an elevated upper eyelid in downgaze, often linked to thyroid eye disease, cicatricial changes, or congenital ptosis.