Horizontal Gaze Nystagmus (hgn) | CarAccidentHome.com

Call any time for a free evaluation

800-566-7404

What does Horizontal Gaze Nystagmus (hgn) mean?

The Horizontal Gaze Nystamus or HGN test is one of the battery of field sobriety tests which are used by police officers to identity drivers who are intoxicated. The HGN or horizontal gaze nystagmus tests measures the oscillation of the driver's eyes or the "involuntary rapid movement of the eyeball, which may be horizontal, vertical, rotatory, or mixed".

To perform this test the officer will move a small light or pen in front of the driver's eyes and measure the following: lack of smooth pursuit of the stimulus, distinct nystagmus at maximum deviation, and onset of nystagmus prior to reaching a 45 degree angle.



« Back to Glossary

Browse Car Accident Terms Alphabetically:
A | B | C | D | E | F | G | H | I | J | L | M | N | O | P | R | S | T | U | V | W | ALL


Do You Need a Lawyer?

Complete the short form and attorney will review your case for FREE. Don't wait -- Get Help Today!


See How Much You're Owed in Compensation!

- Click the Button Below for Your FREE Evaluation -


Why Should I Get an Evaluation with Car Accident Home?

  • Get more money - Getting an estimate will help you know the true value of your claim.
  • Insurance companies will try to pay you less than your claim is worth - don't let them.
  • You'll have the option to speak with a real auto accident attorney in your area - for free!
  • You have nothing to lose! The evaluation is COMPLETELY FREE.