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Hey Friends!My name is Mike and todayI want to teach you about the
magic and importance of the
Visual System
First off, what is the Visual System?
It is our bodies ability to see, observe, and make connectionsIt also makes our body feel in control & centered
Basically, the eye and brain work together to help us make
sense of our physical surroundings using sight (what we see)
LIGHTWAVESAlso known as moving waves of energy They behave in four ways: Reflection, Refraction, Diffraction, and Interference The only reason we can see things is because light,
(from either the sun or a lamp on Earth)
reflects off them into our eyes! If you
were to turn off the source of light, the
objects you once saw would disappear.
They will still exist, but you won't be
able to see them. If you can see your
face in something, it is specular reflection;
If you can't see your face, it is diffuse
reflection.
Reflection:Refraction:When light shines into water, glass, plastic, oranother thick material, it will slow down. It is just like when your
body slows down when you try to walk through water in a pool.
No matter how hard you try, you cannot run as quickly through
water as through air. When light travels through a material and
slows down, it is called refraction.Diffraction:If you screw your eyes up and try to looksat a streetlamp in the dark, the more your eyes close the light will
seem to spread out in strange
stripes as it squeezes through the
small gaps between your eyelashes.
The tighter you close your eyes,
the more light the spreads (until it
disappears when you close your
eyes completely)
Interference:If you stand above a calm pond and dip your finger in, you will see ripples of energy spreading out from that
point. If you do this in two different places, the two sets of ripples
will move towards each other and crash together. They will then
form a new pattern of ripples called an interference pattern. Well,
light behaves in exactly the same way! When two different light
sources travel together and meet up, the waves will interfere with
one another and either join forces to get bigger or just cancel out.
Hey there! Keeping up?Now were going to get into what
the eye is made up of and how
each part works to help us SEE!
Hold on tight because this is
going to be one magical
adventure!
Pupil: the hole in the center of the eye
where light passes through
Iris: the colorful part of the eye, it also has muscles
attached to it that control how much
light goes through the pupil.
Retina: the layer of tissue on the back of the eye.
It has cells that take light the eye sees and changes it into
nerve signals so the brain can understand what it is seeing.
Rods: structures in the eye that respond to light falling on it
in low lighting, not useful for seeing close-up detail
Cones: structures in the eye that respond to color and bright
lighting, they are useful for seeing close-up detail
Cones work in day lightRods work
in dim light
Optic Nerve: the great messenger in the back of your
eye! The rods and cones of the retina change the color
and shapes you see into millions of nerve messages
from the eye to the brain! When you see an image,
your eye quickly tells your brain exactly what you are
seeing so your brain can translate that into "dog", "flower",
or whatever the case may be.
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