[Incomitance patterns in different ocular motility disorders].
By measuring the angles stepwise through the whole field of gaze or through selected meridians the pattern of incomitance can be analyzed. It can be graphically demonstrated by "incomitance curves" or "-lines". A preliminary but very useful guess of the incomitance pattern can be obtained in performing the cover test turning the head of the patient passively in small steps. The Hess-Screen gives a quick and useful graphical overview. Synoptometer and Harms tangent screen allow a detailed study. The evaluation of the incomitance pattern allows conclusions on the etiology and explains the remaining binocular field and the head position. In neurogenic palsies, the angle increases in a linear fashion, whereas in passive motor disturbances the angle may increase sharply, change its direction in the opposite direction of gaze and show a zone of concomitance. Duanes retraction syndrome shows passive components. Examples of patients with specific incomitance patterns are shown.
Universitäts-Augenklinik Basel.
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D003937:Diagnosis, Differential; D006801:Humans; D015835:Ocular Motility Disorders / Q000175:diagnosis* / Q000209:etiology / Q000503:physiopathology; D009801:Oculomotor Muscles / Q000503:physiopathology; D014794:Visual Fields / Q000502:physiology*