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先天性眼球震颤(congental nystagmus简称CN)在人群中的发病率其统计数差别很大。Hemmes(1926)为1/5,000,Anderson(1953)为1/350,Norn(1964)为1/20,000。这很可能不仅反映探讨者们对于其定义的条件规定不同,且他们收集资料的方法也可能各异。目前,在研究CN中规定:出生后或出生后不久(3月),由于血统遗传,在子宫内或出生后受到影响,而发生不随意的眼球振荡即为CN。在特征上,CN患者眼球主要是不由自主地水平向来回摆动,虽然有时出现了垂直震颤,则此常意味是后天性的。眼球震颤的强烈程度(幅度×频率)在不同个体可有极大变化。由于眼球移动而使视觉敏锐度下降,这是因为视网膜小凹区对注视物体的对光时间太短,并
Congenital nystagmus (congental nystagmus referred to as CN) in the incidence of the population statistics vary widely. 1 / 5,000 for Hemmes (1926), 1/350 for Anderson (1953), and 1 / 20,000 for Norn (1964). This probably reflects not only the different conditions that explorers have for their definitions, but also the ways in which they collect information. At present, it is stipulated in the study CN that involuntary eyeball oscillation is CN after birth or shortly after birth (March) due to hereditary inheritance, which is affected in the uterus or after birth. Characteristically, the CN patient’s eye is mainly involuntarily horizontal swing back and forth, although the vertical tremor sometimes appears, this often meaning is acquired. The intensity of nystagmus (amplitude × frequency) varies greatly among individuals. The visual acuity drops due to the eyeball movement because the retina pits have too little light on the object of interest and