nystagmus electrogram

Electroencephalography (ENG) is used for vestibular ocular reflex examination, including visual center examination, position test, cold and heat test, etc. It is an important means to diagnose vertigo. The subjects stood upright and stood vertically in the center of the test balance table. The eyes were looked straight ahead, then the eyes were closed for 1 min, the rest was held for 2 min, and the eyes were recorded for 1 min. The signal was input into the computer to record the closed and blinked eyes respectively. The center of gravity moves the trajectory to print out the map, and calculates the length of the center of gravity movement path, the outer peripheral area, and the moving speed. Basic Information Specialist Category: Ophthalmic Examination Category: Other Inspections Applicable gender: whether men and women apply fasting: not fasting Tips: Inappropriate people: vestibule, visual and proprioceptive structure is complete and functional. Normal value An electric field formed around the eyeball by the potential difference existing between the cornea (positive potential) and the retina (negative potential). The electric field around the eyeball changes accordingly, and the skin electrode placed around the eyeball can derive the change of the electric field, which is transmitted to the recording device through the amplifier to record the nystagmus. The main parameter for analyzing nystagmus is the slow phase angular velocity and duration of nystagmus. Clinical significance Abnormal result If there is nystagmus, repeat the head position examination twice. If the eye movement is not weakened, it is not fatigue type. If the eye movement is weakened or disappeared, it is fatigue type. Need to check the crowd dizziness, nystagmus patients. Precautions Forbidden before examination: use drugs indiscriminately. Requirements for examination: The patient is lying flat. Inspection process The subjects stood upright and stood vertically in the center of the test balance table. The eyes were looked straight ahead, then the eyes were closed for 1 min, the rest was stood for 2 min, and the blink was recorded for 1 min. The signal is input into the computer, and the movement of the center of gravity of the closed and blinking eyes is printed separately, and the length of the moving center of the center of gravity, the area of ​​the outer circumference and the moving speed are calculated. Not suitable for the crowd Inappropriate crowd: The vestibule, visual and proprioception are structurally intact and functional.