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



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