Comment j'examine un mouvement oculaire anormal

Abnormal eye movements generally correspond to nystagmus and saccadic intrusions or oscillations, and less frequently to ocular drifts or paroxysmal ocular tremor. The result is retinal instability, with the functional consequence of oscillopsia and deterioration of visual acuity. Oscillopsia is however lacking when ocular instability develops in a context of blindness or infantile nystagmus. Clinical assessment of abnormal eye movements depends on the clinical context, particularly on whether patients present overt symptoms or not, e.g. decreased visual acuity, vertigo or oscillopsia. For patients complaining of oscillopsia, a precise clinical description of the characteristic features of the abnormal eye movement can be helpful to identify the possible localization of the lesions, or suggest a specific etiology and pharmacological treatment.