Goffart M, Missotten L, Faidherbe J, Watillon M
Arch Int Physiol Biochim. 1976;84(3):493-516. doi: 10.3109/13813457609078571.
The presence of cones in potto's retina has been proved beyond doubt although they are very restricted in number (1 cone for 300 rods). Morphologically, speaking there is no point in calling these cones "rudimentary" except for their slender outer segment. There are red sensitive elements in that retina at wavelengths beyond the spectral sensitivity of visual purple and it is tempting to assume that these elements are cones. The ERG evoked from these elements by red light differs from that in response to white and blue light. They dark-adapt faster than the receptors sensitive to blue and white flashes. However in some of their properties, for example fusion frequency, these cones behave like rods in other species. As these few cones seem to activate the bipolar cells nearly as effectively as the numerous rods, it is suggested that these cones may be responsible for day vision in the potto.
蜂猴视网膜中视锥细胞的存在已被确凿证实，尽管其数量非常有限（每300个视杆细胞中有1个视锥细胞）。从形态学上讲，除了其细长的外段，将这些视锥细胞称为“原始的”并无意义。在该视网膜中，存在对波长超过视紫红质光谱敏感度的红色敏感元件，因此很容易推测这些元件就是视锥细胞。由红光从这些元件诱发的视网膜电图与对白光和蓝光的反应不同。它们的暗适应比对白光和蓝光闪烁敏感的感受器更快。然而，在某些特性方面，例如融合频率，这些视锥细胞的表现与其他物种的视杆细胞相似。由于这少数视锥细胞似乎几乎能像众多视杆细胞一样有效地激活双极细胞，因此有人提出这些视锥细胞可能负责蜂猴的明视觉。
