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只有人、猴等高级动物才有固视机能,即有用双眼中心凹凝视视标的机能。固视机能能影响前庭系的反应,抑制因前庭系不平衡所产生的前庭眼震,从而使身体和眼球运动协调一致。临床上采用的视抑制(visual suppression,V S)试验是通过冷热试验诱发眼震,在反应最强时比较固视和非固视状态下的眼震慢相速度,将固视对慢相速度的抑制用百分数表示之。本试验是检查固视机能的方法之一,有助于某些引起固视障碍的中枢疾患的定位诊断。一、检查方法:用眼震电图描记仪记录眼震,记录原波形用3秒的时间常数,记录速度波形用0.03秒的时间常数,走纸速度为5 mm/秒。在记录原波形和速度波形的同时,可将速度波形的电压加大,削去快相,记录眼震慢相,眼震的最大慢相速度以2cm左右的高度为宜。被检者取仰
Only people, monkeys and other advanced animals have fixation function, that is, the use of both eyes concave and concave visual as the standard function. The fixation mechanism can affect the response of the vestibular system and inhibit the vestibular nystagmus due to the imbalance of the vestibular system, so that the body and eye movements can be coordinated. Clinically, the visual suppression (VS) test is a method of generating nystagmus by hot and cold test. When the response is the strongest, the slow-phase velocity of nystagmus in both fixation and non-fixation is compared. The inhibition is expressed as a percentage. This test is one of the methods to check the fixation function, contribute to some of the central disorders caused by fixation disorder diagnosis. First, the inspection method: recorded with nystagmography nystagmus, recording the original waveform with 3 seconds time constant, the recording speed waveform 0.03 seconds with a time constant, paper speed of 5 mm / s. While recording the original waveform and speed waveform, the voltage of the speed waveform can be increased, the fast phase can be cut off, the slow phase of nystagmus can be recorded, and the maximum slow phase speed of nystagmus can be about 2cm. The subjects were taken Yang