postrotary nystagmus

post·ro·tar·y nys·tag·mus

(pōst-rō'tă-rē ni-stag'mŭs)
1. Reflexive movements of the eyes after a quick rotational movement (e.g., spinning) observed to determine vestibular dysfunction.
2. Involuntary oscillation of the eyes as a result of being rotated after stimulation of the vestibular system by spinning activities.