Hello everyone.
As you all know, eyes provide organisms vision, the ability to process visual detail, as well
as enabling several photo response functions that are independent of vision.
As you are watching this video, have you ever considered how this video would look like
if you were a cat?
Well, in this video, we are going to look at how the internet's favorite subject sees
the world.
The biggest difference between human vision and cat vision is in the retina, a layer of
tissue at the back of the eye that contains cells called photoreceptors.
The photoreceptors convert light rays into electrical signals, which are processed by
nerve cells, sent to the brain, and translated into the images we see.
The two types of photoreceptor cells are known as rods and cones.
Rods are responsible for peripheral and night vision, where they detect brightness and shades
of gray.
Meanwhile, cones are responsible for day vision and color perception.
To put it in simpler words, you see a lot of colors if you have a lot of cones.
And you can see better in the dark if you have a lot of rods.
Cats actually have a high concentration of rod receptors and a low concentration of cone
receptors.
Humans have the opposite, which is why we can't see as well at night but can detect
colors better.
Now let's take a look at the visual field.
This refers to the area that can been when the eyes focus on a single point.
It includes what can be seen straight ahead, as well as above, below, and to the side.
As you can see, cats have a slighter wider visual field of 200 degrees compared to the
average human visual field of 180 degrees.
But, in the aspect of visual acuitty, which is the clearness of vision, the average human
has a visual acuity of 20/20.
A cat's visual acuity is anywhere from 20/100 to 20/200, which means a cat has to be at
20 feet to see what an average human can see at 100 or 200 feet.
This is the reason why cats seem to be nearsighted, which means they can't see far objects really
well.
The ability to see close objects would be well-suited for hunting and capturing prey.
As you probably already noticed, the way cats see colors is also quite different from humans.
It's a common misconception that cats can't see any colors, only shades of gray.
Humans are known as trichromats, meaning they have three kinds of cones that allow them
to see red, green, and blue.
Cats are also thought to be trichromats, but not in the same way that humans are.
A cat's vision is similar to a human who is color blind.
They can see shades of blue and green, but reds and pinks can be confusing.
These may appear more green, while purple can look like another shade of blue.
Other than that, cats also don't see the same richness of hues and saturation of colors
that we can.
Even theough cats can't see fine detail or rich color, but they actually have a superior
ability to see in the dark because of the high number of rods in their retina that are
sensitive to dim light.
As a result, cats can see using roughly one-sixth the amount light that people need.
Cats also have a structure behind the retina, called the tapetum, that is thought to improve
night vision.
Cells in the tapetum act like a mirror, reflecting light that passes between the rods and the
cones back to the photoreceptors and giving them another chance to pick up the small amount
of light available at night.
This is what makes cats' eyes glow in the dark.