VISION Poudre High School By: Ben Kirk Accessory Structures of the Eye Eyelids (Palpebrae):...
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Transcript of VISION Poudre High School By: Ben Kirk Accessory Structures of the Eye Eyelids (Palpebrae):...
VISIONVISION
Poudre High SchoolPoudre High School
By:By:
Ben KirkBen Kirk
Accessory Structures of the EyeAccessory Structures of the Eye
Eyelids (Palpebrae): Windshield Eyelids (Palpebrae): Windshield wipers for the eyes. wipers for the eyes. – Lubricate and remove debriLubricate and remove debri
Lacrimal Caruncle: Produces night Lacrimal Caruncle: Produces night boogers.boogers.– Secreted so that the eyelids don’t stick Secreted so that the eyelids don’t stick
together.together.
Accessory Structures of the EyeAccessory Structures of the Eye
Conjunctiva: Epithelial layer Conjunctiva: Epithelial layer continuous with the inner layer of the continuous with the inner layer of the eye lideye lid
Accessory Structures of the EyeAccessory Structures of the Eye
Lacrimal Apparatus: production, Lacrimal Apparatus: production, distribution, and removal of tearsdistribution, and removal of tears– Lacrimal Gland: Superior and lateral to Lacrimal Gland: Superior and lateral to
the eyethe eyeReleases tears using tear ductReleases tears using tear duct
– Lacrimal Canals: Tube by which tears Lacrimal Canals: Tube by which tears are removed from the eye and enter the are removed from the eye and enter the Lacrimal SacLacrimal Sac
Accessory Structures of the EyeAccessory Structures of the Eye
Lacrimal Apparatus:Lacrimal Apparatus:– Nasolacrimal Duct: Cavity that connects Nasolacrimal Duct: Cavity that connects
lacrimal sacs to the nasal cavitylacrimal sacs to the nasal cavitySwallow or blow out all lacrimal secretionsSwallow or blow out all lacrimal secretions
Eye Diseases, injuries, etc…Eye Diseases, injuries, etc…
Sty: Infection of sebaceous glands of Sty: Infection of sebaceous glands of eyelashes (very painful)eyelashes (very painful)
Conjunctivitis (Pink Eye): Damage to Conjunctivitis (Pink Eye): Damage to and irritation of the conjunctivitisand irritation of the conjunctivitis
Anatomy of the EyeAnatomy of the Eye
General Facts:General Facts:– Approximately 1 inch in diameterApproximately 1 inch in diameter– Approximately 8 g in weightApproximately 8 g in weight
Eye AnatomyEye Anatomy
Posterior/Vitreous Chamber:Posterior/Vitreous Chamber:– Filled with vitreous humor (gel like Filled with vitreous humor (gel like
consistency)consistency)– Used to maintain shape of the eye and Used to maintain shape of the eye and
hold retina in placehold retina in place
Eye AnatomyEye Anatomy
Anterior Chamber:Anterior Chamber:– Separated from posterior chamber by Separated from posterior chamber by
iris and cilliary bodiesiris and cilliary bodies– Filled with Aqueous Humor (water like Filled with Aqueous Humor (water like
consistency)consistency)– Function: circulation of nutrients and Function: circulation of nutrients and
wastes as well as eyeball wastes as well as eyeball structure/shapestructure/shape
Layers of the EyeLayers of the Eye
Fibrous Tunic: Tough outer layer for Fibrous Tunic: Tough outer layer for protection and muscle attachmentprotection and muscle attachment– Sclera: White of the eyeSclera: White of the eye
Connective tissue where all extrinsic Connective tissue where all extrinsic muscles attach.muscles attach.
– Cornea: Continuous with scleraCornea: Continuous with scleraFibers are arranged to allow light passage Fibers are arranged to allow light passage
(Cornea appears clear)(Cornea appears clear)No blood vessels, very hard to repair No blood vessels, very hard to repair
Layers of the EyeLayers of the Eye
Vascular Tunic: Middle LayerVascular Tunic: Middle Layer– Iris: Colored region of the eyeIris: Colored region of the eye
Muscles that regulate pupil sizeMuscles that regulate pupil size
– Pupil: Opening in the center of the irisPupil: Opening in the center of the iris– Ciliary Body: Mass of muscle connected Ciliary Body: Mass of muscle connected
to the lens to change its shapeto the lens to change its shape– Choroid: Layer of blood vessels that Choroid: Layer of blood vessels that
separates the fibrous and neural tunics separates the fibrous and neural tunics posterior to the ciliary bodies.posterior to the ciliary bodies.
Layers of the EyeLayers of the Eye
Neural Tunic: The RetinaNeural Tunic: The Retina– Photoreceptors: Rods and ConesPhotoreceptors: Rods and Cones
Rods: Light detection (night vision)Rods: Light detection (night vision)Cones: Color DetectionCones: Color Detection
– Fovea: Focal point of all imagesFovea: Focal point of all imagesHighest concentration of conesHighest concentration of cones
– Optic Disk: Where optic nerve and Optic Disk: Where optic nerve and blood vessels leave the vitreous blood vessels leave the vitreous chamberchamberBlind SpotBlind Spot
The Lens:The Lens:– Focuses image on retinaFocuses image on retina– Physically changes shape Physically changes shape
Lens AbnormalitiesLens Abnormalities
Cataracts: Lens becomes cloudyCataracts: Lens becomes cloudy Glaucoma: Increased fluid pressure Glaucoma: Increased fluid pressure
inside the eye, pinching the optic inside the eye, pinching the optic nervenerve
Myopia: NearsightednessMyopia: Nearsightedness– Eyeball is too deepEyeball is too deep
Hyperopia: FarsightednessHyperopia: Farsightedness– Eyeball is too shallowEyeball is too shallow
GlaucomaGlaucoma
MyopiaMyopia
http://www.tehranlasik.com/images/myopia.jpg
HyperopiaHyperopia
http://www.stlukeseye.com/Conditions/Hyperopia.asp
Masters of IllusionMasters of Illusion
Focus on the dot and move your head side to side or Focus on the dot and move your head side to side or forward to back…forward to back…
How many legs does the How many legs does the elephant have?elephant have?
Stare at the black dot and Stare at the black dot and watch the haze disappear…watch the haze disappear…
Shapes that don’t exist…Shapes that don’t exist…
What do you see?What do you see?
The Impossible TridentThe Impossible Trident
Straight or crooked?Straight or crooked?
Count the Black Dots!!!Count the Black Dots!!!
Circles or Spirals?Circles or Spirals?
Crooked or Straight?Crooked or Straight?
Optical illusions in shape!Optical illusions in shape!
Floating SphereFloating Sphere
Can you make them stop spinning?Can you make them stop spinning?
Image CreditsImage Credits http://waynesword.palomar.edu/images/blckdots.jpghttp://waynesword.palomar.edu/images/blckdots.jpg
http://www.is.svitonline.com/malinman/optic/spirkrug.gifhttp://www.is.svitonline.com/malinman/optic/spirkrug.gif http://www.sapdesignguild.org/resources/optical_illusions/images/couple.gifhttp://www.sapdesignguild.org/resources/optical_illusions/images/couple.gif
http://waynesword.palomar.edu/images/lines.jpghttp://waynesword.palomar.edu/images/lines.jpg http://www.eyesearch.com/optical.vase.gifhttp://www.eyesearch.com/optical.vase.gif
http://www.sackville.ednet.ns.ca/art/gallery/exhibit/draw/Escher,M.C.-Relativity-1953.jhttp://www.sackville.ednet.ns.ca/art/gallery/exhibit/draw/Escher,M.C.-Relativity-1953.jpgpg
http://www.math.technion.ac.il/~rl/M.C.Escher/2/escher-hands.gifhttp://www.math.technion.ac.il/~rl/M.C.Escher/2/escher-hands.gif http://www.cbu.edu/~jvarrian/252/eye.gifhttp://www.cbu.edu/~jvarrian/252/eye.gif
http://www.city.ac.uk/colourgroup/spectrum.gifhttp://www.city.ac.uk/colourgroup/spectrum.gif http://medweb2.bham.ac.uk/image_database/bain/images/229339c.jpghttp://medweb2.bham.ac.uk/image_database/bain/images/229339c.jpg
http://www.eyesearch.com/astigmatism.jpghttp://www.eyesearch.com/astigmatism.jpg http://www.whiteeye.net/images/myopia.jpghttp://www.whiteeye.net/images/myopia.jpg
http://www.colorado.edu/epob/epob1220lynch/image/figure6n.jpghttp://www.colorado.edu/epob/epob1220lynch/image/figure6n.jpg http://www.rktekt.com/ck/im/FineArt/eye.jpghttp://www.rktekt.com/ck/im/FineArt/eye.jpg http://mathworld.wolfram.com/gifs/ouchi.gifhttp://mathworld.wolfram.com/gifs/ouchi.gif
http://www.aetheronline.com/mario/images/Favourite%20Images/Opticalhttp://www.aetheronline.com/mario/images/Favourite%20Images/Optical%20Illusions/14_jpg.jpg%20Illusions/14_jpg.jpg
http://www.mercola.com/2003/sep/27/illusion4.gifhttp://www.mercola.com/2003/sep/27/illusion4.gif http://members.cox.net/mystic-warrior/mag2.jpghttp://members.cox.net/mystic-warrior/mag2.jpg