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Transcript of Eye Dissection
The eye is a remarkable invention that enables
us to see all the wonderful things in life. Without it,
we would be seeing a black screen throughout our lives
(pretty boring, isn it?) The eye is made up of a multitude of parts, all working together in harmony to bring us a crystal clear image of the world (clearer than HD!!!) Parts of the eye... a brief summary
Retina: Located at the back of the eye. It detects images that were focused by the cornea and lens. The retina is connected to the brain by the optic nerve.
Lens: A convex lens (to be precise!) that bends incoming light and makes an image on the retina. It's also flexible; it can change shape according to whether you are looking far or close up.
Vitreous Humor: A jelly like fluid surrounding the eye which helps shape and give the eyeball its normal shape.
The eye dissection...
We got the amazing opportunity to dissect a sheep's eye. Looking at all the amazing parts was really breathtaking and astonishing. It was a truly remarkable and magnificent experience! Choroid Coat: The layer of the eye that supplies nutrients and oxygen to the outer layers of the retina.
Cornea: A covering over the iris and pupil that helps protect the eye.
Aqueous Humor: A clear fluid that helps the cornea keep a rounded shape. Pupil: A dark circle in the center of the iris.
It lets light into the eye and can be adjusted to varying
amounts of light.
Iris: The muscle that controls the amount of light entering
the eye. This is commonly referred to as your eye colour.
Sclera: The thick and tough covering of the eyeball.
Optic Nerve: A bundle of nerves that sends information from
the retina to the brain. The Sclera
The thick and tough
covering of the eyeball.
Its job is to protect the eye from the many injuries that could happen. The sclera is white and opaque so
that light can only enter the pupil. The Lens
A flexible convex lens that is able to bend the
incoming light and focus it onto the retina.
One of the unique abilities of this lens is that it can
be made thin or thick depending on the object that
you are trying to focus on. When you look at far things,
the lens is thin (focal length is longer) and thick when you look
at near things (focal length is shorter). The lens also inverts
things you see so that everything appears upside down.
Amazingly, your brain sees the image as upright and turns the
image right side up (can you imagine seeing everything upside
down?). Common eye problems such as myopia occur when
the lens is unable to bend light onto the retina due to the eye shape
being too long or short. The Retina... and a bit about rods and cones
The retina is the part of the eye that forms
the images that we see in everyday life (it receives bent light from the cornea and lens). This is where special light detecting cells: rods and cones are located. Both kinds of cells have colour pigments that enable them to paint the images for us. Rod cells help us see in darkness where we are able to detect movement and shapes. Cone cells help us see all the colours of the rainbow and will only work if there is a light source available. The retina is connected to the brain by the optic nerve. The Cornea
A tough, sturdy, and clear covering
over the iris and pupil which helps protect the inner eye from being damaged. The cornea starts the process of making an image onto the retina. The cornea actually bends most of the light; the lens just bends the remaining bits and finishes the job. The Vitreous Humor
The thick and clear jelly that fills up most of
the eye. It gives the eyeball its shape, holds it up and prevents it from collapsing.
The Aqueous Humor
Another fluid that is located between the cornea and lens. This gives the cornea its rounded shape and also prevents it from collapsing. The Choroid Coat
The middle coat of the eye located between
the retina and the sclera. It contains blood vessels and capillaries so that it can provide oxygen and nourishment to the outer layers of the retina. The Pupil
A dark circle located in
the center of the iris. It
lets incoming light enter
the eye via the cornea. The
most remarkable thing about
the cornea is that it can shrink
or expand depending on
how much light is entering
the eye. For instance, if there
is a huge burst of sunlight, your
pupil as a reflex, immediately
shrinks due to massive amounts
of light getting in (your eye doesn't
need to absorb so much light). On
the other hand, if you are in a dim room,
your pupil immediately expands because
there is little light getting into your eye
(your eye needs more light!). The Iris
A stretchable muscle that controls the
pupil (it makes it small or large) and controls
how much light gets into the eye. Human irises
come in many different colours including brown,
blue, green, and gray due to genetics. This is commonly referred to today as your eye colour.
Fun fact: Did you know that a cow's iris is brown?
Thanks for Watching!!!
By: Albie C. and Chad B. Some other interesting eye parts...
(don't forget them!!!)
Blind Spot: This is where the optic
nerve leaves the retina. You are unable to
see things in this spot because there are no
light detecting cells in this area.
Tapetum: A shiny material located behind the
retina. Found in animals with good night vision,
the tapetum reflects light back through the retina
(which is why an animal's eyes glow in the dark!). The Optic Nerve
This is a bunch of nerve fibers
that carries information from
the retina to the brain. When
the light hits the retina, the
image is inverted, therefore it
sends the information so that
the brain can interpret the image
as upright. Many dreadful eye
diseases, such as glaucoma, are a
result of damage to the optic nerve. Sclera Cornea Vitreous Humor Aqueous Humor Lens Pupil Retina