HorizonGirl
Topic Author
Posts: 743
Joined: Tue Mar 29, 2005 3:59 pm

A Question About Eyesight

Sun May 20, 2007 1:42 pm

Hello everybody!

I know this may seem like a strange question to be asking, but something has been
bugging me lately. Last year in grade 10, we were talking about how our eyesight
works in science. We learned that coloured objects appear that colour because they absorb
all colours of light, except they reflect the one colour they don't absorb.
The object is the colour of light it reflects. Black absorbs all colours of light.
Are our pupils black so they can absorb all colours of light?
And if they were another colour, say, blue, would we not be able to see that colour because
our eyes couldn't absorb it?
Hopefully this makes a little sense!


Devon
Flying high on the Wings of the Great Northwest!
 
iamcanadian
Posts: 704
Joined: Wed May 30, 2001 6:53 am

RE: A Question About Eyesight

Sun May 20, 2007 1:52 pm

Quoting HorizonGirl (Thread starter):
Are our pupils black so they can absorb all colours of light?

Like any other object that has colour, the pupils aren't actually "black", rather, they appear black because they absorb all/most colours of light.  smile 

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Yellowstone
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Joined: Wed Aug 16, 2006 3:32 am

RE: A Question About Eyesight

Sun May 20, 2007 1:55 pm

Your pupils appear black for the same reason that, if you poke a small hole in a box and look through it, the inside will look black, whatever color it actually is. The pupil is transparent, and not enough light gets through to illuminate the inside. That's why doctors have that device to shine a light into your eye, so they can take a look in through your pupil.
Hydrogen is an odorless, colorless gas which, given enough time, turns into people.
 
HorizonGirl
Topic Author
Posts: 743
Joined: Tue Mar 29, 2005 3:59 pm

RE: A Question About Eyesight

Sun May 20, 2007 2:02 pm

Thanks for your responses, makes a lot more sense now.  Smile

Devon
Flying high on the Wings of the Great Northwest!
 
aloges
Posts: 14842
Joined: Tue Jan 17, 2006 3:38 am

RE: A Question About Eyesight

Sun May 20, 2007 7:33 pm

Quoting Yellowstone (Reply 2):
The pupil is transparent, and not enough light gets through to illuminate the inside. That's why doctors have that device to shine a light into your eye, so they can take a look in through your pupil.

 checkmark  What they see with that is the back of the eye, I'd call the colour yellow-ish. And then you have the blood vessels.
Don't cry because it's over, smile because it happened.
 
redngold
Posts: 6673
Joined: Wed Mar 22, 2000 12:26 pm

RE: A Question About Eyesight

Mon May 21, 2007 2:50 am

Quoting HorizonGirl (Thread starter):
Are our pupils black so they can absorb all colours of light?

There is a layer in the retina which is black. It is very thin, so when you shine a strong light into it, you see the blood vessels and the fatty layer behind this layer. If you were to open up an eye, the retina would appear black. (I've done this type of dissection on a cow's eye.)
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