Faidherbe J, Goffart M, Lecomte J
C R Seances Soc Biol Fil. 1975;169(6):1641-3.
There is histological evidence for the presence of cones in potto's retina: about 1 cone for 300 rods. The ERG of the dark adapted animal resembles that of the night monkey. In the potto's retina some red sensitive elements respond to wavelenghts beyond those which affect visual purple. The ERG evoked by these long wavelenghts differs from that produced by white light, suggesting a duplex character of the retina. These red sensitive receptors dark adapt faster than the others. However their fusion frequency is low, if compared with that in other species with a duplex retina. Nevertheless in potto the critical fusion frequency is higher for red light than for blue light.
大约每300个视杆细胞中有1个视锥细胞。暗适应动物的视网膜电图与夜猴的相似。在懒猴的视网膜中，一些对红色敏感的元件对超出影响视紫红质的波长作出反应。这些长波长诱发的视网膜电图与白光产生的不同，表明视网膜具有双重特性。这些对红色敏感的感受器比其他感受器暗适应得更快。然而，与其他具有双重视网膜的物种相比，它们的融合频率较低。尽管如此，在懒猴中，红光的临界融合频率高于蓝光。
