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The horizontal gaze nystagmus test is a type of field sobriety test used to measure nystagmus, which is the medical term for an involuntary jerking of the eyeballs. Nystagmus can occur for many reasons, but becomes more pronounced when someone is intoxicated.
Can Astigmatism affect HGN test results for DUI? Yes. ing to the AOA (American Optometric Association), nearsightedness/astigmatism/poor eye muscle development may also cause nystagmus.
The first standardized field sobriety test that officers rely on during a DUI investigation is the HGN, or the Horizontal Gaze Nystagmus test. Nystagmus refers to the involuntary jerking of the eyeballs. The jerking becomes more pronounced when someone is intoxicated by alcohol or certain drugs.
The last clue is nystagmus at maximum deviation, which means that the eyes begin jerking within four seconds while looking all of the way to the side. If the officer observes four or more clues, he or she has probable cause to make an arrest for driving under the influence.
Acquired nystagmus is often a symptom of a separate condition that affects the central nervous system. Nystagmus can also be caused by albinism, congenital diseases such as cataracts, inflammation of the inner ear, certain medications, nearsightedness or astigmatism, or lack of development of the eye early in life.