Structure and Function of the Eye – Vision (PSY, BIO)

by Tarry Ahuja, MD

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    I got my eye on you. Let’s talk about vision. We’re going to talk about structure and function of the eye. So, the eye is comprised of three layers: the sclera, the choroid, and the retina. The sclera is what gives us the white in our eyes. That’s the white portion of the eye and that’s the outermost layer. Then we have the choroid, which is the darkly colored -- the darkly colored layer and that absorbs all the excess light. And then we have the retina which is the one that you hear about the most, and this is the surface where light is actually focused and a lot of that processing happens. So we can see all the three layers here. And you’ll also notice that the sclera continues to go over the front of the eye and that’s a clear portion of the eye that we’ll talk about in just a sec. So the idea here is light is refracted as it passes through the cornea. So the outside light coming in goes through to the cornea, which is an extension of the sclera. And its job is to actually control where it’s going to go a little bit. It enters the anterior chamber. So there’s a chamber there that’s filled with a fluid termed aqueous humor. You’re going to need to know that term for sure for the MCAT. So one way you can try to remember that is aqueous humor, funny, water. I don’t know. Sometimes that helps me. Sometimes it’s stupid, but I like stupid things. So aqueous humor, funny, water. Now that, that fluid fills that chamber. And what happens is as the light enters, there’s an iris. And the iris is the colored part of the eye, that’s what gives us the...

    About the Lecture

    The lecture Structure and Function of the Eye – Vision (PSY, BIO) by Tarry Ahuja, MD is from the course Sensing the Environment.

    Included Quiz Questions

    1. Ciliary muscle
    2. Aqueous humor
    3. Cornea
    4. Dilator muscle of the iris
    5. Retina
    1. Contraction of radial muscles of iris
    2. Activation of sphincter muscles of iris
    3. Increased production of aqueous humor
    4. Absorption of all excess light by choroid
    5. Contraction of ciliary muscles to focus better
    1. Cornea, anterior chamber, pupil, lens, ganglion cells, interneurons, rods and cones of the retina
    2. Sclera, choroid, retina
    3. Retina, choroid, sclera
    4. Cornea, anterior chamber, pupil, lens, rods and cones, interneurons, ganglion cell layer of retina
    5. Cornea, aqueous humor, iris, lens, retina, optic nerve
    1. Cornea and lens
    2. Cornea only
    3. Iris
    4. Lens and retina
    5. Lens only
    1. Area of the retina without photoreceptors
    2. Area of retina with largest concentration of rods and cones
    3. Black area in the center of the iris
    4. Area of retina with dendrites of ganglion cells converge
    5. Hyperpigmented area of retina
    1. Retina
    2. Sclera
    3. Iris
    4. Lens
    5. Choroid

    Author of lecture Structure and Function of the Eye – Vision (PSY, BIO)

     Tarry Ahuja, MD

    Tarry Ahuja, MD

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    great teacher
    By Ali A. on 06. January 2017 for Structure and Function of the Eye – Vision (PSY, BIO)

    very helpfull lectures, ??? ?????? ?? ?? ?????? ????????..???? ???