Because there's no light reflecting at the cat's eyes.
No. Eyes are not luminous. They observe or perceive light but they do not emit light. Luminous means "emit light." There are various species of animals, such as deer, cats, and dogs, whose eyes have the ability to reflect light which sometimes make them appear to glow in the dark as they reflect a flashlight, headlight, or other light that is shining in their direction. But even then, the eyes do not produce their own light so they are not luminous.
The cat's luminous green eyes shone in the dark night.
Yes your eyes can "glow" like a cat if you mean in the dark. The way to see this is with night vision you can see human eyes "glow" pretty much like cats. cats eyes glow because behind the retna there are mirror like tissues which causes the light to reflect to cause a "glowing" kinnda sense.
Cats' eyes are for seeing. If a cat didn't have eyes, it would have a difficult time doing this. Cats cannot see in true darkness. However, they do see rather better in low-light conditions than humans do. One (of several) reasons for this is that they have a reflective layer in their eyes that basically acts as a mirror to send light back through the retina a second time. This is also why their eyes appear to glow in the dark... they're actually reflecting a small portion of the light that comes into their eyes back out again. Normally you don't notice this much, but it's more obvious when their surroundings are dark.
because tigers are really big cats and are related to cats
As a cats eye pupils dilate in the dark, letting in more light, they are very good at seeing in the dark.
A dark night can appear luminous due to the presence of sources of light such as stars, the moon, or artificial lighting. These sources can create a subtle illumination that allows us to see in the darkness.
What an interesting concept. No, cat urine does not glow. It has no special fluroescent properties. Perhaps this originated from the fact that cats' eyes glow in the dark, for a quite different reason than urine might ever have to glow.
seeing in the dark, to help them find there way around
Cats are nocturnal household pets, meaning that against all odds they can see in the dark. There eyes glow at night, causing this.
hes eyes
No, it is not normal. It is very uncommon but not unheard of.