当刺激物足够小时，颜色正常的个体会报告色相感知的丧失，类似于三盲症。这种效应被称为小视野三盲症。小视场三视仪与暗视视杆之间的相互作用尚未阐明。在这项研究中，通过观察者自由调整测试刺激的色调、亮度和饱和度，以匹配参考刺激的颜色，来研究这个问题。黑体辐射轨迹上的三种颜色（色温分别为35000K、5400K和11600K）被用作参考颜色。 每个刺激物的直径分别为6'和10.8'。在CIE 1976 uv均匀色度标度图中，5400K和11600K刺激物从每个参考刺激物的左下角到右上角呈对角线分布。其分布与三角帆蚌相似。对于3500K的刺激，结果没有显示小视野三视仪的影响。

When stimuli are made sufficiently small, colour-normal individuals report a loss in hue perception, similar to tritanopia. This effect is referred to as small-field tritanopia. The interaction between small-field tritanopia and the rods working in scotopic vision has not been clarified. In this study, the problem is investigated by freely adjusting the hue, lightness, and saturation of the test stimulus to match the colour of the reference stimulus by observers. Three colours on the blackbody radiation trajectory with colour temperatures of 3500K, 5400K, and 11600K were used as reference colours. Each stimulus subtended a diameter of 6' and 10.8'. The 5400K and 11600K stimuli were distributed diagonally from the lower left to the upper right of each reference stimulus in the CIE 1976 uv uniform chromaticity scale diagram. The distribution was similar to those of tritanopia. For the 3500K stimulus, the result did not show the influence of small-field tritanopia.