physiological nystagmus
phy·sio·lo·gicalnystagmus
noun
1.
small involuntary tremors of the eyeballs; when physiological nystagmus is eliminated by stabilizing the image on the retina the perception fades rapidly from fatigue of the retinal receptors
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WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.