What causes hgn?

Answer 1

There are a few causes of horizontal gaze nystagmus (HGN) such as

positional alcohol nystagmus- Alcohol consumption

PCP

Fatigue nystagmus (when eyes are held at max deviation for more then 30 seconds)

brain tumours or brain damage

pysiological nystagmus which is too small to be seen by the naked eye

optokinetic nystamus- can be caused by watching strobe lights rotating lights or rapidly moving traffic at close proximity

Caloric- fluid motion inside the canal of the vestibular system is stimulated by temperature (such as putting cold water in one ear and warm in the other caution this can cause you to become verry ill do not try this)

rotational nystagmus is when some one is rapidly spun causing the fluid in the inner ear to become disturbed

postrotational nystagmus is when the person stops spinning the fluid inside the ear still continues to be disturbed for a period of time

[DWI Detection and Standardized Field Sobriety Testing February 2006 edition student manual NHTSA]