Human Physiology : How Does the Eye See Color?


Your friend is wearing a red shirt and blue
pants. Well how does your brain even know to interpret that red and blue is what’s going
on? Hi I’m Janice Creneti and I’m here to talk to you about how the eye sees color.
Well like many parts of the human body, the eye is pretty complicated and it has a lot
of parts. And all those parts work together to help you do it’s job. So lets take a look
at our human eye here. We’ve got the cornea which is sort of that bulging part of your
eye. That’s where the light first enters. Then there’s also a pupil. That’s the black
part of the eye that opens and closes and determines how much light actually comes in.
You’ve also got the lens and then the lens and the cornea work together to help light
get to the retina. Well this is where everything starts to happen. The retina actually has
a couple of different types of cells on it. Some are called rods and some are called cones.
And it’s the job of the cones to help you see color. So that light coming in and it’s
got different wavelength depending on the color of it is. Gets focused on the back of
the eye. Well still how is the body actually the brain recognizing that there’s color going
on here at all. Well those images have to actually travel from the optic nerve to your
brain. It’s actually the brain’s job to interpret that’s red, that’s blue and to send those
messages back to you so that you recognize that color. So as you can see it’s a pretty
involved process. All of which is necessary for you to recognize blue from red from purple.
I’m Janice Creneti and this is how the eye sees color.

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