Monocular elevation Deficit/ Double elevator palsy
Definition: Double elevator palsy is classically defined as a congenital inability to elevate one eye, with the limitation more in abduction than adduction.1 MED is most often associated with ptosis/pseudoptosis. The word Double elevator palsy was coined by Dunlap to describe the weakness affecting both muscles of elevation i.e. superior rectus and inferior oblique. Pathogenesis/Theories: 2 Superior Rectus palsy: Superior rectus is the main elevator in abduction, adduction, or primary position. Thus, the defective elevation can be explained by the presence of superior rectus palsy alone. Inferior rectus restriction: Subsequently it was found that inferior rectus restriction can also cause such a limitation. The word double elevator palsy is a misnomer, Nearly 70% of cases, the cause for limitation was found to be IR restriction and not palsy. This was confirmed in several studies using saccadic velocity measurement and forced duction test. Supranuclear palsy: The nucleus for upgaze is
Dr. Tarika Perikal · Dr. Sowmya R, MS,FMRF, FAICO