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Rani Banik MD | Eye Doctor on Instagram: "The Optokinetic Nystagmus (aka OKN) Drum! Ever seen this tool in an ophthalmologist’s office and wonder what it’s used for? The OKN Drum can be used to: - assess intact visual acuity in non-verbal patients such as young children - distinguish functional vision loss from true vision loss - check for convergence retraction in cases of dorsal midbrain syndrome - assess vertical saccades (or lack thereof) in cases of supranuclear palsy - and much more! Any q
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Can’t Look Up? Think Parinaud Syndrome | Dorsal Midbrain Lesion Light–near dissociation, convergence-retraction nystagmus, eyelid retraction (Collier’s sign), and impaired upgaze point toward Parinaud syndrome. This classic dorsal midbrain (pretectal) lesion is most commonly caused by pineal region tumors, but can also result from multiple sclerosis, hydrocephalus (setting-sun sign), or midbrain stroke. A high-yield clinical and imaging diagnosis—especially for exams and neuro rounds. 👇 Type “P
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