3.The tigers retinas comprise mainly rod receptors, which are cells that are sensitive to low light levels and can perceive very slight movements. There are some cone cells (colour receptors) in each eye, but these are used more for day vision, and not to perceive a range of different colours. In fact, it is thought that some tigers likely only see dull greens, blues and reds, while others see in black and white.
4.The tapetum lucidum is a layered, mirror-like structure behind the retina that reflects light back into the eye for a second time so that the eye and brain can form a brighter image of it.
5.There is a wide line of nerves running horizontally across the centre of the eye. This makes a huge difference to the peripheral vision capabilities of the tiger and allows them to be aware of approaching dangers as well as of prey that may be slightly out of their immediate field of sight.
The nictitating membrane is present in tigers in addition to top and bottom eyelids. This membrane can sweep across the eye, keeping it clean and moist.
In a life dominated by necessity, the tigers sense of sight is an essential part of its very survival.