Fox D L, Kuchnow K P
Science. 1965 Oct 29;150(3696):612-4. doi: 10.1126/science.150.3696.612.
There lies directly beneath the tapetum lucidum, in the eyes of many elasmobranch fishes, a layer of darkly pigmented choroid cells which, in bright light, extend individual strands that aggregate to form a dark, compound curtain which shields the reflecting tapetal cells. This process is reversed in dim light or in darkness; the tapetum is exposed and visual sensitivity presumably Increased. The black choroid pigment has been isolated, analyzed, and shown to possess the properties of melanin.
在许多软骨鱼类的眼睛中，脉络膜层的一层色素沉着较深的细胞直接位于明毯之下。在强光下，这些细胞会伸出单独的细丝，这些细丝聚集形成一道黑色的复合帘幕，遮挡住具有反射作用的明毯细胞。在弱光或黑暗环境中，这个过程则会逆转；明毯暴露出来，视觉敏感度大概会提高。黑色的脉络膜色素已被分离、分析，并显示具有黑色素的特性。
