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Physiologic nystagmus Tag

Dayton DUI Attorney Charles Rowland > Posts tagged "Physiologic nystagmus"

What Is Wrong With The HGN? (by DaytonDUI)

The horizontal gaze nystagmus test is an eye test approved by the National Highway Traffic Safety Administration(hereinafter NHTSA) as a tool to detect clues of impairment in drivers.  The HGNtest is one of three psychomotor tests approved as part of the standardized field sobriety testing protocol employed by law enforcement officers throughout the United States and used here in Ohio.When an officer asks you to follow his pen, he is performing the horizontal gaze nystagmus test.  Nystagmus is defined as the oscillation of the eyeball that occurs when there is a disturbance of the vestibular system or the oculomotor control of the eye.  The nystagmus the...

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The 47 Types & 38 Causes of Nystagmus; (It’s Not Just Caused by Alcohol)

The horizontal gaze nystagmus test is an eye test approved by the National Highway Traffic Safety Administration(hereinafter NHTSA) as a tool to detect clues of impairment in drivers. The HGNtest is one of three psychomotor tests approved as part of the standardized field sobriety testing protocol employed by law enforcement officers throughout the United States and used here in Ohio. The HGN is a test of your eyes wherein the testing officer is looking for abnormal movements call saccades.  These movements make the eye appear to bounce or wobble.  The officer uses this movement to make a correlation to alcohol use.  This would valid only if we are...

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Fatigue and the Horizontal Gaze Nystagmus Test

Can simple fatigue explain a person's poor performance on the Horizontal Gaze Nystagmus test?  According to recent studies the answer is yes.  Here is a link to the first formal study demonstrating that the smooth pursuit portion of the HGN test is affected by fatigue, http://iospress.metapress.com/content/8758844418248700.  The study found that sleep deprivation impaired smooth pursuit. Quoting from the study's abstract: Our findings showed that sleep deprivation deteriorated smooth pursuit gain, smooth pursuit accuracy and saccade velocity. Additionally, the ratio between saccade velocity and saccade amplitude was significantly decreased by sleep deprivation. However, as the length of sleep ...

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Dayton DUI Defense Attorney Earns Certification

Dayton DUI defense attorney Charles M. Rowland II has earned certification in the administration and evaluation of standardized field sobriety tests by attending the Standardized Field Sobriety Testing Certification Student Course (NHTSA Course). This training course certified Charles Rowland in the most current NHTSA approved SFST training curriculum. This is the same NHTSA SFST training course that law enforcement officers are trained in nationwide and testify to in court. Certified attorneys are trained in: Perspectives on recognizing driving behavior exhibited by impaired drivers; Attitudes and skills in detecting the impaired driver; Understanding the tasks...

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