Optometry : journal of the American Optometric Association
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Horner's syndrome results from disruption of the sympathetic innervation to the eye anywhere along its three-neuron circuit. It is essential to be familiar with the oculosympathetic pathway, the structures that are in close proximity to it, and the disease processes that may interrupt it when an evaluation is made of an acquired Horner's syndrome, since it may be a manifestation of a life-threatening condition. ⋯ Familiarity with the sympathetic pathway to the eye and its anatomical relationships enables one to understand the mechanism by which a Horner's syndrome has developed.