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Jeffrey Browen Presents: The Anatomy of the Eye

Jeffrey Browen, OD shares with us some of the intricacies of the eye. We learn the difference between rods and cones, the iris and pupil, and much more!

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Jeffrey Browen Presents: The Anatomy of the Eye

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Presentation Transcript

  1. How eyes work The way we see what we see. Part I.

  2. Light: The Source • Sun provides us with light • Light is integral to vision • We perceive the world through vision (as opposed to olfaction), so it’s important to know how it works.

  3. A couple key terms • Sclera: Outermost layer, gives eye it’s shape. • Cornea: The front layer of the sclera. Light hits this section first. • Extraocular muscles: The muscles that allow you to move your eye.

  4. A couple key terms • Choroid: Second layer. Holds all the blood vessels responsible for getting blood to the eye. • Ciliary Body: Front of choroid. Muscles allow the lens to relax and adjust size. • Iris: That colored part of your eye! It’s all determined by pigment. Right in the middle is the pupil.

  5. more anatomy • Dialator: This muscle in the iris is key for letting more light in the eye. Makes iris smaller and pupil larger • Sphincter: Another iris muscle that is the opposite of the dialator. Allows in less light, and makes the iris larger and pupil smaller.

  6. Inner layer • The retina is the part of the eye that actually senses light • contains rods which take over in low light, and cones which take over color vision duties • In the back of the eye and center of the retina is the macula, which houses the fovea centralis, which allows us to see fine details.

  7. View of the doctor • Vitreous humor fills a large section in the back of the eyeball • A smaller section houses aqueous humor, which is drained through the canal of Schlemm • Glaucoma results when that drainage is blocked up

  8. More parts • The lens is a fascinating part that sharpens our vision • Ever had pink eye? That’s really called conjunctivitis or inflammation of the conjunctiva, a membrane that keeps our eyes moist.

  9. Protection • Ever wonder how our eyes remain relatively safe? • The bony structure called the orbital cavity provides protection; so does a cushion of fat • Our eyelids protect our eyes when we blink, and it spreads tears over the eyes (important for moisture) • Eyelashes and eyebrows keep dust and foreign objects out of the eye

  10. We hope you learned something! • Special Thanks to HowStuffWorks.com

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