See No Evil Eye Anatomy How the Eye

How the Eye Works • Pathway of light rays through the eye • Cornea

Eye Anatomy • Cornea: – Clear outer part of the eye – Helps focus

Eye Anatomy • Aqueous Humor – – thin, watery fluid fills the space between

Eye Anatomy • Iris – Colored part of the eye – Regulates the amount

Eye Anatomy • Pupil – Opening at the center of the iris – Size

Eye Anatomy • Lens – Clear part of the eye behind the iris –

Eye Anatomy • Vitreous Humor: clear gel filling the inside of the eye

Eye Anatomy • Macula – Small, sensitive area of retina – Central vision –

Eye Anatomy • Fovea – Center of the macula – Sharpest vision – high

Eye Anatomy • Retina – Light sensitive tissue – Lines the back of the

Rod cells • Located in retina • Sensitive to light • “night vision” •

Cone cells • Located in retina • Distinguish colors in daylight • Modified neuron

Eye Anatomy • Optic Nerve – Bundle of sensory nerve fibers (over one million)

Miscellaneous Eye Structures • Choroid: layer of blood vessels that feeds the retina

Miscellaneous Eye Structures • Eyelid – skin-covered structure – Protection – Spreads tears –

Miscellaneous Eye Structures • Sclera – “whites of the eyes” – Tough outer coat

Retina Scan • Identification through distinguishing marks of the eye (retina)

Myopia • Near sighted – Can only clearly see objects up close – Lens

Hyperopia • Far sighted – Can only clearly see objects far away – Lens

Eye diseases • Cataracts – Clouding of the lens – Accumulation of dead cells

Eye diseases • Astigmatism – Irregular shaped cornea or lens (correctable) – Focus on

Eye diseases • Glaucoma – Silent thief of sight – Gradually builds up pressure

Eye diseases • Conjunctivitis: AKA Pink Eye – Inflammation of the conjuctiva (clear membrane

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See No Evil

Eye Anatomy

How the Eye Works • Pathway of light rays through the eye • Cornea aqueous humor iris/pupil lens vitreous humor fovea/macula retina rods/cones optic nerve brain

Eye Anatomy • Cornea: – Clear outer part of the eye – Helps focus in front of the eye

Eye Anatomy • Aqueous Humor – – thin, watery fluid fills the space between the cornea and the iris nourishes the cornea and the lens gives the front of the eye its form and shape.

Eye Anatomy • Iris – Colored part of the eye – Regulates the amount of light entering the eye

Eye Anatomy • Pupil – Opening at the center of the iris – Size of opening controlled by iris

Eye Anatomy • Lens – Clear part of the eye behind the iris – Focus light onto retina – Allows focus on near and far objects

Eye Anatomy • Vitreous Humor: clear gel filling the inside of the eye

Eye Anatomy • Macula – Small, sensitive area of retina – Central vision – Contains fovea

Eye Anatomy • Fovea – Center of the macula – Sharpest vision – high concentration of rods (B & W) and cones (Color)

Eye Anatomy • Retina – Light sensitive tissue – Lines the back of the eyeball – Sends electrical impulses to the brain

Rod cells • Located in retina • Sensitive to light • “night vision” • Black and white • Modified neuron

Cone cells • Located in retina • Distinguish colors in daylight • Modified neuron

Eye Anatomy • Optic Nerve – Bundle of sensory nerve fibers (over one million) – Carries visual information to the brain (occipital lobe)

Miscellaneous Eye Structures • Choroid: layer of blood vessels that feeds the retina

Miscellaneous Eye Structures • Eyelid – skin-covered structure – Protection – Spreads tears – Limits light entrance

Miscellaneous Eye Structures • Sclera – “whites of the eyes” – Tough outer coat

Retina Scan • Identification through distinguishing marks of the eye (retina)

Myopia • Near sighted – Can only clearly see objects up close – Lens focuses light/image in front of the fovea

Hyperopia • Far sighted – Can only clearly see objects far away – Lens focuses light/image in back of the fovea

Eye diseases • Cataracts – Clouding of the lens – Accumulation of dead cells – Images look blurred or fuzzy

Eye diseases • Astigmatism – Irregular shaped cornea or lens (correctable) – Focus on two or more points instead of one – Blurred vision, headaches, eye strain

Eye diseases • Glaucoma – Silent thief of sight – Gradually builds up pressure inside the eye (retinal cells and optic nerve dies) – Can cause irreversible blindness

Eye diseases • Conjunctivitis: AKA Pink Eye – Inflammation of the conjuctiva (clear membrane that covers the sclera) – Usually caused by bacteria or viruses