Phoria adaptation to prisms. A cerebellar-dependent response.
Phoria adaptation to prisms. A cerebellar-dependent response.
复制标题
隐斜视对棱镜的适应。
作者：
D. Milder;R. Reinecke
在正常人中，水平棱镜放置会导致隐斜视的明显变化，变化量与所用棱镜的度数相等，方向相反。然而，所测量的隐斜视逐渐向放置棱镜之前的值返回。这被称为隐斜视适应。在5名正常受试者和5名小脑缺损患者中测量了这种反应。患者组的反应幅度显著降低。两组的视力和融合储备相当。患者组的平均年龄较大，立体视锐度下降。这些因素不太可能解释患者反应降低的原因。结果提示，正常人隐斜视的适应性反应依赖于小脑的完整性。
Horizontal prism placement in normal subjects results in an apparent change in phoria by an amount equal in power and opposite in direction to the prisms used. However, the measured phoria gradually returns toward the value preceding the placement of prisms. This is termed phoria adaptation. This response was measured in five normal subjects and five patients with cerebellar deficit. The magnitude of the response was significantly reduced in the patient group. Visual acuities and fusional reserves were comparable in the two groups. The mean age was greater, and the stereoscopic acuity decreased, in the patient group. These factors were unlikely to account for the reduced response in patients. The results suggest that the phoria adaptation response in normal subjects depend on the integrity of the cerebellum.