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Visual system

Ashley Rivera Julio Castro David Almaguer. Visual system. EYE. The human eye allows us to see with color and fine details and movements.

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Visual system

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  1. Ashley RiveraJulio Castro David Almaguer Visual system

  2. EYE The human eye allows us to see with color and fine details and movements. The pupil regulates the amount of light with the iris. The cornea is like a thin shield to keep out germs, dust, and other harmful matter. It also acts like a lens.Alens changes shape to refract light to be focused on the retina ,which is on the back of the eye.

  3. The Retina • The retina is the back of the inner eye that has photoreceptors. The photoreceptors convert light energy into electrical signals for the brain.The two photoreceptors are rods, which work best in dim light and cones, which work best in bright light. The retina also have these things called neurons which process visual information and even make up some of the optic nerve.

  4. Visual Transmitters: Optic Nerve, Optic Chiasm, Optic Tract The Optic Nerve transmits visual information from the retina to the brain. This nerve is the 2nd out of 12 paired cranial nerves. If damaged the consequences could be permanent loss of vision. The Optic Chiasm is where both nerves cross. The information from the left is transmitted to the right and vice versed. The Optic tract is the continuation of the optic nerve and connect to the lateral geniculate nucleus.

  5. Lateral Geniculate Nucleus • The Lateral Geniculate Nucleus is located in the thalamus. Thelateral geniculate nucleus is the main center for visual information in the brain. This receives input from the retinas and optic nerve.

  6. The visual cortex and optic radiation The visual cortex is in the brain and is responsible for processing visual information . It is in the part of the brain called the occipital lobe. Optic radiation carries the information to the visual cortex and to another part of the brain called the calcarine fissure.

  7. Cataracts and Its Causes • Cataracts is a disorder when clouding occurs in the lens of the eye. The lens focus on objects so with clouding the lenses will decrease in vision efficiency. • Cataracts is caused by natural aging, trauma for water from other parts of the eye entering ,and iodine deficiency.

  8. Cataracts Treatment • The treatment for cataracts consists of surgery performed at anytime. • 90% of patients get 20/40 vision or better • Another way to fix cataracts is an artificial lens inserted permanently • A side effect of the treatment is retinal detachment( Retina slowly peels away.

  9. Bibliography Works Cited “Eye Health Center”. WedMD.N.p.2005-2013.Web.12 May 2013. < http://www.webmd.com/eye-health/picture-of-the-eyes>. Johnson, George B. and Peter H. Raven. Biology. Austin :Holt, Rinehart, and Winston,2007.Print. McGhee, Karen, and George McKay. “Eyes" Encyclopedia of Anatomy. Washington: National Geographic Society, 2007. Print.

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