Ocular bobbing is a distinctive movement disorder occurring in a variety of related forms herein classified as `typical', `monocular', and `atypical'. `Typical' ocular bobbing occurs in patients with paralysis of horizontal conjugate eye movements and consists of abrupt, spontaneous downward jerks of the eyes with a slow return to the mid position. The `monocular' type reflects co-existing unilateral third nerve paresis in addition to the bobbing. The `atypical' type includes either a variation unexplained by associated oculomotor palsy, or bobbing with intact spontaneous or reflex horizontal eye movements.
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