Eyesight
How is Color Created?
Rods and cones are what help us see the way we do.
Rods are what causes night vision and perception of brightness. They are concentrated just outside of the fovea. Also, rods are highly sensitive to light. Cones, however, are moderately sensitive to light. They are most useful in daylight and are responsible for color vision. Cones are located mainly in the fovea, more specifically, in the center of the fovea.
Then, these messages are sent to the brain, where they are interpreted as eyesight. This whole process happens incredibly fast.
This Is What The Human Eye Looks Like:
What Is Color Blindness?
The most common type of color blindness is seeing red and green as the same color.
There are also other kinds of color blindness such as deuteranope (the absence of the green cone cell in the retina). Other types are protanope (the absence of the red cone cell in the retina), and tritanope (the absence of the blue cone cell in the retina).
One in twelve men are color blind and one in twenty women are color blind... as you can see color blindness isn't that rare!