Atlas of Ophthalmology

Midbrain Pupils

Midbrain Pupils
Top: Both pupils of this 10-year-old boy are moderately dilated. Neither responded to direct light stimulation. Bottom: During fixation on a near target, both pupils briskly constrict to 2.5 mm. Light-near dissociation of the pupils is a feature of the dorsal midbrain syndrome. Other findings include vertical gaze palsy, convergence-retraction nystagmus, impairment of vergence movements, and lid retraction.
Pollock, Stephen C. , M.D., ¦1, Mebane NC, USA
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Neuro-Ophthalmology -> Pupillary Abnormalities -> Neurogenic Disorders -> Midbrain Pupils
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