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Visionary System

Visionary System. By: Andrea Delgado , Liann Do , & Jesse Sias. STRUCTURE. Cornea: a curved, transparent front of the eye that covers the pupil Iris: the circular, colored membrane that surrounds the pupil (the iris is a muscle)

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Visionary System

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  1. Visionary System By: Andrea Delgado, Liann Do, & Jesse Sias

  2. STRUCTURE • Cornea:a curved, transparent front of the eye that covers the pupil • Iris: the circular, colored membrane that surrounds the pupil (the iris is a muscle) • Lens: is located behind the iris which is the part that contains color. Lens focuses the light. • Aqueous humor: located in the anterior of the lens

  3. Ciliary muscle:connected to the lens to change the shape of the eye • ciliary body: located right behind the lens. • Sclera:the outer layer of the eye, made up of soft connective tissue • Choroid: located between Sclera and Retina and has a network of capillaries • Retina: lining of tissue that is located at the back of the eye & it is sensitive to light

  4. Conjunctiva: a thin, pigmented, outer layer, covering the sclera • Blind spot: a dot on the retina where the optic nerves leave the eye • Fovea: located in the middle of the Retina. • Aqueous humor: located in the anterior chamber of eyball • Vitreous humor: transparent and jelly-like; located behind the lens

  5. FUNCTION • Cornea: protects the eye from harmful matter & focuses light entering the pupil • Choroid: has a network of capillaries to remove waste and supply nutrients to cells • Also forms the iris(helps control the amount of light entering the eye • Sclera:holds the shape and covers all of the eye except for the cornea • Conjunctiva: Keeps the eye moist with help of tears • Retina: contains photoreceptors that respond to light • Rods: respond well to dim light & allows you to see black and white (helps with night-vision) • Cones: respond well to bright light & allows you to see color

  6. Fovea: helps maintain accurate vision Pupil: allows light to pass through into the eye Lens: bends to focus light that enters the eye on to the retina Ciliary Body: supports the lens, focuses on a near target, and produces inner-eye fluid Ciliary muscle: changes the shape of the lens Lens is flattened for farther objects Lens is rounded for closer objects Aqueous humor: fluid in that provides the cornea & lens with oxygen & nutrients Vitreous humor:acts as a “cushion” for the lens to protect it

  7. 10 Essential Facts 1. Since the blind spot has no light sensitive cells, vision is obstructed at that spot.2. Pupils become smaller in bright light.3. When dim light is present, the pupil lets more light in.4. Optic nerve takes signals from the retina to the brain .5. Cones react to colored light only function in bright light. 6. Rods see in black, white, and grey and able to function well at night7. Light hits the retina at the back of the eye to project an image.8. The cornea focuses light entering the eye and protects it from harmful matter. 9. The iris of your eye is the circular, colored membrane that surrounds the pupil. 10. The lens focuses light rays entering the eye.

  8. THYROID EYE DISEASE • (a.k.a. Graves' disease) caused by the production of abnormal antibodies that attack the thyroid gland and cause it to become overactive. • Patients with this disease must work with an endocrinologist to maintain a normal thyroid hormone level. They must also take Oral and intravenous (IV) corticosteroids to control the swelling and decrease pressure on the optic nerve. • mild inflammations: treated with topical lubricants and non-steroidal anti-inflammatory tablets • severe inflammations: oral or IV cortisone may be required to reduce the inflammation. Certain patients may need radiation therapy. If the disease is very severe, surgery might be needed to decrease inflammation.

  9. BIBLIOGRAPHY • "Anatomy of the Human Eye  ." AE Visual Library. Web. 29 Apr. 2012. <http://www.accessexcellence.org/RC/VL/eye_anatomy/human_eye_anatomy.php>. • BauschLomb1. "A Journey Through the Human Eye: How We See." YouTube. YouTube, 03 Aug. 2010. Web. 29 Apr. 2012. <http://www.youtube.com/watch?v=gvozcv8pS3c>. •  "Eye Anatomy | InterActive Health." Health Blog. Web. 29 Apr. 2012. <http://iahealth.net/eye-anatomy/>. • Isaaq01. "Process of Vision Animation." YouTube. YouTube, 29 Sept. 2009. Web. 29 Apr. 2012. <http://www.youtube.com/watch?v=0HzWmldLDHI>. • Johnson, George B., and Peter H. Raven. "Chapter 41: Nervous System Section 3: Sensory Systems." Holt Biology. Orlando, Florid: Holt, Rinehart and Winston, 2007. 958. Print. • Youssem, David. "Orbital Pathology." The Radiology Assistant. Web. 29 Apr. 2012. <http://www.radiologyassistant.nl/en/489ca7c544b19>.

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