Nagy A L, Boynton R M
J Opt Soc Am. 1979 Sep;69(9):1259-65. doi: 10.1364/josa.69.001259.
A color-naming method was used to examine the large-field red/green discriminations of dichromats screened with standard tests. The stimulus was a 12 degrees annular field with the central 4 degrees removed, flashed for 300 ms. Four wavelengths were equated in brightness for each observer at two retinal illuminance levels, approximately 10 and 100 trolands. The stimuli were then presented in random order and the observer was asked to name each, using one of four color terms. The entire experiment was done with the observers dark-adapted and also with the rods bleached. For all four deuteranopes and two of four protanopes, color names were very significantly related to both illuminance and wavelength in both adaptation conditions. The relationship between name and wavelength was similar to that of a normal trichromat, but the performance of a dichromat was very poor by comparison. Performance was generally somewhat better in the dark than with the rods bleached. However, the result in the bleached condition is consistent with recent evidence that at least some observers who are classified as dichromats with standard small-field screening procedures actually have a weak residual third cone mechanism.
采用颜色命名法检查经标准测试筛选出的二色视者的大视野红/绿辨别能力。刺激物是一个去除中央4°的12°环形视野，闪烁300毫秒。在两种视网膜照度水平（约10和100特罗兰）下，为每位观察者使四个波长的亮度相等。然后以随机顺序呈现刺激物，要求观察者用四个颜色术语之一命名每个刺激物。整个实验在观察者暗适应以及视杆细胞被漂白的情况下进行。对于所有四名绿色盲患者和四名红色盲患者中的两名，在两种适应条件下，颜色命名与照度和波长均非常显著相关。命名与波长之间的关系与正常三色视者相似，但相比之下，二色视者的表现非常差。通常在暗适应条件下的表现比视杆细胞被漂白时稍好。然而，视杆细胞被漂白条件下的结果与最近的证据一致，即至少一些经标准小视野筛选程序被归类为二色视者的观察者实际上具有微弱的残余第三视锥细胞机制。
