We will go through a number of different
structures and functions of the eye.
The most important of which, is to try think
about what the eye needs to function correctly.
It is gonna need to have light.
It’s gonna need to have bright enough light
to be able to get that image to the back in the eye.
And lot of that depends upon how
open the eye is to let in the light in.
Besides that the other thing it’s gonna be
very important is the frequency of that light.
Now remember light has two properties in physics.
It is both a photon eye a
particle as well as a way of light.
So we have to keep both of those intension
as we move forward trying to discover
how we’re going to collect that?
and then interpret it in the brain.
Going over some of the structures
will be helpful in this initial process.
We have an anterior chamber
that has fluid associated in it
The reason why you need to have
this fluid in this anterior chamber
is because the cornea is a vascular.
Meaning it doesn’t have any blood flow going to it.
And that is important for us in the vision sent
because you have a red blood cells
travelling through the cornea.
You would get light would not be
able to penetrate some of the heme molecules.
So in this case it doesn’t have any blood vessels.
But you still have to bathe it with fluid.
so that those structures don’t die.
The iris will help control the pupil diameter.
You have the posterior chamber in which the fluid
is starting from and eventually moves through the pupil
into the anterior chamber.
These processes ongoing.
you’re always making new fluid from the
ciliary epithelium into the posterior chamber
travelling to the anterior chamber.
That is a constant process
always flowing into that direction.
In fact it develops a pressure.
So people often times measure an intraocular pressure.
And that should be somewhere between
about 8 to 22 millimeters.
If it’s too high, they start to get worried about glaucoma.
The lens of the eye is going to help focus
the image onto the back of the eye or the retina.
These zonule fibers are what pull the lens
either stretching it or making it less stunt
so that you can get that focused image to the right spot.
You also have other structures towards
the back of the eye such as the retina.
The retina is going to have
are photoreceptive cells in it.
There’s a couple special spots like
the fovea, which only have cones in it.
And we’re gonna go through rods and cones quite a bit
when we talk about eye structure function relationship.
You also have the optic disc.
The optic disc is where the optic nerve lives from.
So they are actually no photo receptors in the optic disc.
It’s a blind spot if you want to think of it as such.
You will not see any images in this spot because
this is where the nerves are travelling back to the brain.
Finally, everyone always thinks about a connective tissue.
The sclera is the kind of what
usually think of as a whites of their eye.
It’s that part of the eye that
is going to be connective tissue
and allow you to move your eye round
so you could focus at different things.