horizontal gaze nystagmus test
noun
horizontal gaze ny·stag·mus test
-ni-ˈstag-məs-
: a test for intoxication (as of a driver) based on observation of involuntary jerking movements of the eyes as they follow horizontal motion
Note: This test is one of several usually administered by police officers to determine the sobriety of a suspected drunk driver.
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Merriam-Webster unabridged
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