Teping C
Klin Monbl Augenheilkd. 1981 Sep;179(3):169-72. doi: 10.1055/s-2008-1057284.
Monocularly evoked cortical potentials were recorded monopolarly (3 cm above Prot. occ. ext. sup.) to steady-state checkerboard stimuli (check sizes 1.4 to 26 min, rev. freq. 7/s, mean luminance 10.8 cd/m2, field diameter 4.5 deg., centr. fix.). For a number of visual acuities (obtained by inserting plus lenses up to 3.0 dpt) the smallest check size evoking reliable VECPs was related to the visual acuities obtained at a visual test chart. The use of 20 instead of 100 per cent contrast stimuli provided a significant decrease of slope of threshold check size versus visual acuity, resulting in a three-fold increase in the resolution of data. The method permits the evaluation of visual acuities between 0.1 and 1.0 in normals and patients within limits of +/- log 0.1 (1 sigma) and +/- log 0.2 visual acuity (2 sigma).
对稳态棋盘格刺激（方格大小1.4至26分视角，反转频率7次/秒，平均亮度10.8坎德拉/平方米，视野直径4.5度，中心注视），单眼记录单极诱发的皮层电位（在枕外隆凸上方3厘米处）。对于多种视力（通过插入最高达3.0屈光度的正透镜获得），诱发可靠视觉诱发电位的最小方格大小与在视力检查表上获得的视力相关。使用20%而非100%对比度刺激可使阈值方格大小与视力关系曲线的斜率显著降低，从而使数据分辨率提高三倍。该方法能够在正常人和患者中评估0.1至1.0的视力，误差范围在±log 0.1（1标准差）和±log 0.2视力（2标准差）内。
