Convergence-Retraction Nystagmus on Physical Exam Convergence-retraction nystagmus: irregular, jerky nystagmus, associated with convergence and retraction of both eyes, especially on attempted upgaze. ? damage to the supranuclear fibers, which have an inhibitory effect on the midbrain convergence or divergence neurons. Excessive & sustained discharge from the medial rectus and other extraocular muscles. CRN localizes to the dorsal midbrain & is usually part of Parinaud's syndrome. Dorsal mesencephalic syndrome and acute hydrocephalus after subarachnoid hemorrhage Dr. Boby Varkey Maramattom @bobvarkey #Convergence #Retraction #Nystagmus #PhysicalExam #clinical #ocular #video #neurology
