a sign of ophthalmopathy caused by spasm of the smooth muscle portion of the levator palpebrae superioris due to sympathetic overactivity (as in from Graves hyperthyroidism).
Evaluated by instructing the patient to follow the examiner's finger as it moves downwards. Lid lag is present if the sclera can be seen above the iris as the patient looks down.
endocrinology
Amboss level4
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO?
Memorize