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Poudre High School By: Ben Kirk
VISION Poudre High School By: Ben Kirk
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Accessory Structures of the Eye
Eyelids (Palpebrae): Windshield wipers for the eyes. Lubricate and remove debri Lacrimal Caruncle: Produces night boogers. Secreted so that the eyelids don’t stick together.
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Accessory Structures of the Eye
Conjunctiva: Epithelial layer continuous with the inner layer of the eye lid
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Accessory Structures of the Eye
Lacrimal Apparatus: production, distribution, and removal of tears Lacrimal Gland: Superior and lateral to the eye Releases tears using tear duct Lacrimal Canals: Tube by which tears are removed from the eye and enter the Lacrimal Sac
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Accessory Structures of the Eye
Lacrimal Apparatus: Nasolacrimal Duct: Cavity that connects lacrimal sacs to the nasal cavity Swallow or blow out all lacrimal secretions
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Eye Diseases, injuries, etc…
Sty: Infection of sebaceous glands of eyelashes (very painful) Conjunctivitis (Pink Eye): Damage to and irritation of the conjunctivitis
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Anatomy of the Eye General Facts: Approximately 1 inch in diameter
Approximately 8 g in weight
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Eye Anatomy Posterior/Vitreous Chamber:
Filled with vitreous humor (gel like consistency) Used to maintain shape of the eye and hold retina in place
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Eye Anatomy Anterior Chamber:
Separated from posterior chamber by iris and cilliary bodies Filled with Aqueous Humor (water like consistency) Function: circulation of nutrients and wastes as well as eyeball structure/shape
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Layers of the Eye Fibrous Tunic: Tough outer layer for protection and muscle attachment Sclera: White of the eye Connective tissue where all extrinsic muscles attach. Cornea: Continuous with sclera Fibers are arranged to allow light passage (Cornea appears clear) No blood vessels, very hard to repair
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Layers of the Eye Vascular Tunic: Middle Layer
Iris: Colored region of the eye Muscles that regulate pupil size Pupil: Opening in the center of the iris Ciliary Body: Mass of muscle connected to the lens to change its shape Choroid: Layer of blood vessels that separates the fibrous and neural tunics posterior to the ciliary bodies.
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Layers of the Eye Neural Tunic: The Retina
Photoreceptors: Rods and Cones Rods: Light detection (night vision) Cones: Color Detection Fovea: Focal point of all images Highest concentration of cones Optic Disk: Where optic nerve and blood vessels leave the vitreous chamber Blind Spot
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The Lens: Focuses image on retina Physically changes shape
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Lens Abnormalities Cataracts: Lens becomes cloudy
Glaucoma: Increased fluid pressure inside the eye, pinching the optic nerve Myopia: Nearsightedness Eyeball is too deep Hyperopia: Farsightedness Eyeball is too shallow
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Glaucoma
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Myopia
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Hyperopia
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Masters of Illusion
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Focus on the dot and move your head side to side or forward to back…
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How many legs does the elephant have?
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Stare at the black dot and watch the haze disappear…
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Shapes that don’t exist…
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What do you see?
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The Impossible Trident
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Straight or crooked?
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Count the Black Dots!!!
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Circles or Spirals?
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Crooked or Straight?
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Optical illusions in shape!
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Floating Sphere
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Can you make them stop spinning?
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Image Credits http://waynesword.palomar.edu/images/blckdots.jpg
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