Schmidt B, Blum T
Doc Ophthalmol. 1985 Aug 30;60(2):197-201. doi: 10.1007/BF00158035.
After stimulation of the left and right half-fields, it is possible to record contralateral visually evoked neuromagnetic fields (VEF) without any reference to the size of the half-field stimulus display. The test reacts extremely sensitively upon each shifting of the half field into the periphery to the left or right. By application of half-field pattern stimuli of an extremely high or low spatial frequency, characteristic deviation angles are obtained for both the spatial frequencies after evaluation of the VEF amplitudes. By this method the foveal acuity in RP can be investigated with an objective procedure to a very high degree of accuracy.
在刺激左右半视野后，可以记录对侧视觉诱发电磁场（VEF），而无需参考半视野刺激显示的大小。该测试对左右半视野向周边的每次移动都极其敏感。通过应用极高或极低空间频率的半视野图案刺激，在评估VEF振幅后可获得两种空间频率的特征偏差角。通过这种方法，可以用客观程序非常高精度地研究视网膜色素变性（RP）患者的中央凹视力。
