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The Human Eye

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by

Shannon Harman

on 19 April 2010

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Transcript of The Human Eye

How Stuff Works Optical Illusions How do optical
illusions work? We are able to see and understand
optical illusions because of the way our brain and eyes work. Optical illusions are observed through our senses. We are able to understand them and see them the way they are because it agrees with one of our senses but disagrees with another. How does the eye work? Lens of the eye: biconvex transparent body situated
behind the iris in the eye; its role, along with the cornea, is to focus on the retina.
Cornea: The clear fron window of the eye that transmits and focuses light into the eye.
Pupil: The opening of the iris.
Sclera: The tough white outer coat other the eyeball that covers approximately the posterior five-sixths of its surface.
Optic nerve: The optic nerve connects the eye to the brain. The optic nerve carries the impulses formed by the retina, the nerve layer that lines the back of the eye, and senses light and creates impulses.
Iris: The iris is the circular, colored curtain of the eye. Its opening forms the pupil.
Retina: The retina is the nerve layer that lines the back of the eye, senses light, and creates impulses that travel through the optic nerve to the brain.
Vitreous humor: is clear, jelly-like substance that fills the middle of the eye.
3D Movies How do red and blue 3D
glasses work? The way that 3D glasses work
is simple. Instead of showing us a movie from one camera view, we see it from two which makes each eye see a different picture through each different lens. This then creates the effect of a 3D movie. The way the human eye works
is simple. First light passes
through our pupil and then
through the lens. The lens
then focuses the light on the
retina. This then stimulates
the rods and cones in our eyes.
Then small nerve fibers pick up
the signals from the rods and
cones and sends them to the optic
nerve which then sends the signal
to the brain. The brain then picks
up the signal and tells us what
we are seeing.
Conclusion The human eye is pretty simple
to understand. First light passes
through the pupil and the lens and
is then directed towards the retina. The retina then stimulates the rods and cones in your eye and sends a signal to small nerve fibers which then sends the signal to the optic nerve. From here, the signal is sent to the brain where we interpret the image. The Eye Optical Illusions We are able to see optical
illusions becase of our senses.
When we see an image and it agrees
with one of our senses but not
another, we see and optical illusion. 3D Movies 3D movies work because of the
way that they are projected. A
normal movie is shown from one
camera angle but a 3D movie is
shown from two. This makes each
eye pick up a different picture
which makes the image seem to
jump off the screen. This is the Hermann grid illusion. This is explained
by literal inhabition,where in the receptive field of the retina light and dark receptors compete with one another to become active. In the Hermann grid illusion, the gray spots appear at the intersections because of the inhibitory response which occurs as a result of the increased dark surround. How is 3D better today? 3D today is better because
today we use computer generated imagery.
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