Understanding the Framework of the Human Eye

Jul 11, 2014

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    Human Eye: The Marvel

    The human eye is a beautiful miracle which lets us see the beauty we are surrounded with.

    It is an organ with a complex structure that lets us observe even the minutest of details. So, have you ever wondered how the eye functions and how the marvel happens? Here is how the phenomenon takes place.

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    The Eyeball

    The eyeball, which is made of water, jelly and, proteins, is created in a way that it is capable of producing detailed 3D images that too in colour. The eyeball can focus itself and with the wink of an eye, it can switch vision from a tiny particle to a distant mountain peak. The eyeball is made up of these parts:

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    Sclera or often known as whites of the eyes, is the tough white tissue covering the major portion of the eyeball. It is the muscles which are attached to the sclera that provide movement to the eye.

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    Cornea is the transparent cover of the eye which takes in light. To understand better, imagine the cornea to be a window through which you can see things.

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    Iris is the coloured part of the eye. It is placed under the cornea, which contracts and relaxes in order to control the amount of light entering the eyeball.

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    The round and black hole placed inside the center of the iris is known as the pupil. Light enters the eyeball through the pupil which enables vision. Its muscles allow it to change its size easily.

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    Just like the cornea, the lens is a transparent tissue inside the eye. It is located behind the pupil and its function is to help the light to focus on the back of the eyeball.

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    Vitreous Gel

    The jelly substance inside the eyeball that helps it to maintain shape is known as the vitreous gel.

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    Retina is a tissue located on the back wall of the eyeball which consists of photosensitive cells known as rods and cones. Rods are responsible for perceiving the colours as black, white, and different shades of gray. The cones help the eye to differentiate between different colours and to observe the fine details of different subjects.

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    Optic Nerve

    Optic nerve consists of over one million nerve fibers that take the signals from rods and cones of the retina and send it to the brain where they are converted into a film consisting of images; this is broadly known as the human eyesight.

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