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  • Our topic for today is Human Eye.

  • The human eye is one of the most valuable sense organs that enables us to see the world around us.

  • Let us study about the different parts of an eye.

  • Sclera is a tough outer coat that protects the entire eyeball.

  • Choroid is a vascular layer of the eye.

  • It contains blood vessels that nourish the inner parts of the eye.

  • Hurry.

  • Please sit properly.

  • Sorry.

  • No Worries.

  • Cornea is the front portion of the eye.

  • It is convex in shape and bulges outside.

  • Light enters the eye through the cornea.

  • Hey.

  • Iris is a dark muscular diaphragm located just behind the cornea.

  • It regulates the amount of light entering the eye by adjusting the size of the pupil.

  • Pupil is a hole in the middle of the iris.

  • Size of the pupil decreases or increases depending upon the intensity of light entering the eye.

  • Eye lens is made up of a transparent jelly like substance, which is made up of proteins.

  • It is held in position by the ciliary muscles and suspensory ligaments.

  • The ciliary muscles and suspensory ligaments adjust the focal length of the eye so that we can see distant and nearby objects clearly.

  • The ability of the eye to focus on distant and nearby objects by changing the focal length is called accommodation.

  • Please go inside.

  • Aqueous humor is a viscous liquid filled in the area between the cornea and eye lens.

  • It prevents the eye from collapsing due to changes in the atmospheric pressure.

  • Where are you going?

  • I was just taking a walk.

  • Please get inside. I don't want to be late.

  • Hey

  • Hey

  • Retina is a delicate membrane having a large number of light sensitive cells.

  • The light sensitive cells get activated upon illumination and generate electrical signals.

  • The light sensitive cells are are of two types.

  • Rods: Cells that respond to the intensity of light.

  • Cones: Cells that respond to the color of objects.

  • Hey.

  • What is this?

  • This is the macula.

  • It is a tiny area in the retina which is responsible for clear and sharp vision.

  • Hey.

  • Did you know that there is a small depression inside the macula.

  • It is called the fovea centralis.

  • Here, maximum number of cones are present.

  • An inverted real image of the object is formed on the retina.

  • The electrical signals generated by the cells are sent to the brain through the optic nerve.

  • The brain reassembles the signals into a meaningful image and gives rise to the sensation of vision.

  • Come on.

  • Bravo.

  • Seems like jelly.

  • Vitreous humor is a jelly like substance filled in the space between the retina and the eye lens.

  • It helps in maintaining the shape of the eye.

  • Blind spot is a small region in the retina where the optic nerve enters the eye.

  • It is insensitive to light.

  • Hence, it is called the blind spot.

  • Different parts of an eye.

  • Sclera, Choroid, Cornea, Iris, Pupil, Eye lens, Ciliary muscles, Suspensory ligaments, Aqueous humor, Retina, Vitreous humor, Optic nerve, Blind spot

  • We forgot something.

  • Macula.

  • Fovea centralis.

  • Thank you.

Our topic for today is Human Eye.


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B2 中高級 美國腔

人類的眼睛|#aumsum (Human Eye | #aumsum)

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    AumSum 發佈於 2021 年 01 月 14 日