It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina.
它的视网膜上每平方毫米有一百万个视锥细胞,所以它能分辨出很细微的视觉差别。
2
Conesin each half of the retina are adapted to produce different light-filtering pigments.
每半边视网膜上的锥体能够产生不同的光过滤颜色。
3
Each of the three standard color-detecting conesin the retina — blue, green and red — can pick up about 100 different gradations of color, Dr. Neitz estimated.