Dogs have a reflective surface at the back of their eyes to increase their night vision. You may see this in other nocturnal animals such as cats, raccons, and even deer. When the light hits it at certain angles, you will see a mirror like reflection. Different animals have different colored reflections, often green or red, although deer tend to be silver. The purpose of this is to increase the light to the retina, which increases the night vision of the animal. I know the surface has a name, but I don't remember what it is called. I was a bio major 20+ years ago and some things have slipped away...Hope this is what you were asking.
The same thing that causes you to blink constantly. Their eyes are dry and they are keeping them moist.
Cats and dogs blink with both eyes, though sometimes if they wanted to for any reason they can blink with one eye only and leave the other eye open, which is called a wink.
our eyes blink because the rays of the sun hits our eyes directly which causes them to close and when we open our eyes again the same process is done...
to look at someone and blink your eyes.
Many birds, reptiles, and mammals have nictitating membranes on their eyes. These membranes are transparent and can blink while leaving the eyes open.
Yes, Tasmanian devils can blink their eyes.
The future tense of "blink" is "will blink." For example, "I will blink my eyes."
You have to blink or else your eyes will dry out.
your eyelashes protect your eyes from dust particles. when you blink it's mainly to lubricate your eyes. to add moisture back into your eyes if you didn't blink then your eyes would be very dry.
when you blink your brain is saying you eyes are dry and something like that
When your eyes get dry or irritatted.
because you are cleaning your eyes and pathogens are all over and they enter you eyes. when they enter your eyes you n.eed to clean them, so you blink