In this example #3, nystagmus is conjugated, i e, symmetrical between the eyes, so one eye only is shown. Try making a diagnosis using the lazy dog before looking at the interpretations given at the bottom of this page.
Interpretation
Example #3
shows a conjugated, vertical, down-beating jerk nystagmus in the primary position. The nystagmus increases its amplitude on down gaze and vise versa. It is typically yet more pronounced on looking down and to the side ("side-pocket" nystagmus). Downbeat nystagmus often arises with expansive lesions located to the anterior aspect of the foramen magnum. Downbeat nystagmus may occur as a side effect of lithium treatment. There is also an idiopathic form.
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