NHTSA | National Highway Traffic Safety Administration

☐ Hold stimulus approx. 12” to 15” in front of face, above eye level. Equal Pupil Size Resting Nystagmus Equal Tracking. Instructions Stage: ☐ Place your left foot on a line, (real or imaginary) and put your right heel against the toe of the left foot. ☐ Place your arms down at your sides.

The Horizontal Gaze Nystagmus (HGN) Field Sobriety Test checks your eyes for involuntary jerking as you gaze to the side. The test begins by the police officer placing the tested person …

For officer safety keep your weapon away from the suspect. Position stimulus approximately 12-15 inches from the subject's nose. “I am going to check your eyes.” “Keep your head still and …

Horizontal Gaze Nystagmus (HGN) Test. Up to 35% of normal, sober individuals have a difference in pupil sizes of 0.5 mm or more, but fewer than about 10% have a difference of 1.0 mm or more. Most people with any difference in pupil sizes are aware of it. Recent onset, or no prior knowledge, can indicate a recent head injury or stroke.

• Lack of smooth pursuit 2 seconds out and 2 seconds back for each eye (repeat procedure)

These observations form the basis of some of the key assessments of impaired drivers that oficers conduct at roadside during trafic stops, including the Horizontal Gaze Nystagmus (HGN) and Vertical Gaze Nystagmus (VGN) tests.

SFST SCORING SHEET (Check All that Apply) Horizontal Gaze Nystagmus (HGN) Walk and Turn Yes No INSTRUCTIONS STAGE

Testing includes assessment of eye movements, using the Horizontal Gaze Nys-tagmus (HGN) and Vertical Gaze Nystagmus (VGN) tests, which are conducted at roadside by patrol officers. These tests pre-viously have been validated when the subject is …

NORMAL RANGES KEEP IN MIND THAT THERE MAY BE VARIATIONS DUE TO INDIVIDUAL REACTION, DOSE TAKEN AND DRUG INTERACTIONS. PULSE: 60 - 90 BEATS PER …