If sharks' retinas cannot distinguish between different colours of light, as this research suggests, they may be totally colour-blind.
如果鲨鱼的视网膜不能够分辨出不同颜色的光线，就如这项研究所述，那么他们很可能全都是色盲。
Light blue eyes; eyes of different colour (heterochromia).
淡蓝色的眼睛，不同的颜色(异色)的眼睛。
Cones can differentiate between the different wavelengths of light and therefore enable us to see in colour while the more sensitive Rods only give us black and white vision.
锥状细胞能够分辨出光的不同波长，因此可以帮助我们看清色彩获取更多感受，而杆状只能让我们感受到黑色和白色。
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