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Tabarak AlSamarrai

on 5 March 2013

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Transcript of Vision

Finally Learn to appreciate the beauty in your eye and
its complex capability of transforming light
and electromagnetic waves into images :)
every time you take a glance, all this complex procedure occurs. SO BE THANKFUL AND SLEEP WELL!!!! What are the eyes? Vision Structure:
a hollow sphere filled with clear fluid
1)detect light
2)transfer signals(action potentials) to visual processing areas of the brain Key Terminology of the Eye? The Eye Structures are:
1)cornea: protective layer that covers the iris and pupil of the eye
2) pupil: the opening in the eye that allows light to enter
3) iris: the pigmented area of the eye that surrounds the pupil
4)lens: a convex crystalline structure in the eye that focuses light on the retina
5)Retina: the light-sensitive inner layer of the eye
6) Rods: a photoreceptor containing "rhodopsin" that allows a light-sensitive reaction to dim light
7)cones: a photoreceptor within the retina that can produce sharp images and
distinguish colors
8)Optic Nerve: the nerve that transmits signals from the retina of the eye to the
brain The Actual Mechanism • Pupil becomes larger at dark light
• Pupil becomes smaller at bright light
 --->These involuntary responses are controlled by the muscles of the iris
After light passes through the pupil:
1)the lens' muscles bend the light & focus the image formed by the light into the retina.
2)Cones & Rods get stimulated then send an impulse to the occipital lobe
--> occipital lobe: converts the electric impulses into meaningful patterns of shape & color Processing Visual Information Once light enters an eye, it goes through the following structures: Color Blindness & the Blind Spot Each eye has 3 types of cones. Each type is responsible for interpreting different colors, which allows a person to see the various colors of the spectrum. If one cone is missing or doesn't work, Color Blindness results.
Also, each retina has a small area that lacks rods and cons; this area is called the Blind Spot. 1) the thalamus (relay center)
2)cerebral occipital lobe
3) midbrain in the brain stem Lens Pupil Cornea Retina Optic
Nerve Thalamus Cerebrum:
Lobe Photoreceptors Afra, Suezan, Tabarak ღ
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