HorizontalGazeNystagmus.Com
Begin Your Search For A
Capable Defense Attorney

Call Us 24/7 For Legal Help

Administering The HGN Test

Free Online DUI/DWI Case Evaluation

Administering the HGN Test

Before conducting the horizontal gaze nystagmus (HGN) test, the officer is trained to look for conditions or reasons other than alcohol that could cause the driver to fail the test. The object to be used in the test – a penlight or a finger – is quickly waved across the subject’s vision to see that both eyes move in tandem, without signs of blindness or injury. S/he checks to see that the driver’s pupils are of equal size; inequality indicates injury.

Performing The Horizontal Gaze Nystagmus Test

Once the officer determines that to the best of his or her knowledge the driver does not have a medical condition that would affect the eyes, the officer conducts the HGN test. A penlight or even a finger is tracked in front of the driver’s eyes – about one foot distant –and the driver is asked to follow the light or finger with the eyes.

Symptoms Of Nystagmus

The examiner is looking for three indicators of impairment in each eye: if the eye cannot follow a moving object smoothly, if jerking is distinct when the eye is at maximum deviation, and if the angle of onset of jerking of the eyball, instead of smoothly tracking, is within 45 degrees of center.

If, between the two eyes, four or more clues appear, the suspect likely has a BAC of 0.10 or greater.

Free Online DUI/DWI Case Evaluation

States/Abbreviations
AK Alaska LA Louisiana OH Ohio
AL Alabama MA Massachusetts OK Oklahoma
AR Arkansas MD Maryland OR Oregon
AZ Arizona ME Maine PA Pennsylvania
CA California MI Michigan RI Rhode Island
CO Colorado MN Minnesota SC South Carolina
CT Connecticut MO Missouri SD South Dakota
DE Delaware MS Mississippi TN Tennessee
FL Florida MT Montana TX Texas
GA Georgia NC North Carolina UT Utah
HI Hawaii ND North Dakota VT Vermont
IA Iowa NE Nebraska VA Virginia
ID Idaho NH New Hampshire WA Washington State
IL Illinois NJ New Jersey WI Wisconsin
IN Indiana NM New Mexico WV West Virginia
KS Kansas NV Nevada WY Wyoming
KY Kentucky NY New York DC Washington DC