The Parts of The Eye | Structure and Functions of Eye

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The Parts of The Eye

 

The Human Eye 

The human eye is that part of the body that reacts to light for various purposes. (The Parts of The Eye) Eye is the sense with which we see. The human eye can differentiate between 10 million colors.

Eyes are the priceless gift of nature. Eyes are that beautiful miracle by which you become aware of the beautiful sights around you. But the human eye is a complex structure. It is such an organ that allows human beings to observe even the tiniest of things. 

Eye is an important part of the body, with the help of which we see objects. The eye acts like a camera. The eye is covered from outside by a hard and opaque white membrane, which is called sclerotic. 

 

Structure and Functions of Eye 

Humans use their eyes as the most precious object, as much as they are sensitive to their eyes, perhaps not as much as to any other organ because all the experiences associated with seeing are through the eyes. 

The structure of the human eye acts like a camera. The average diameter of the eyeball is 25 mm and the weight is about 7 grams. On the human face, there are two holes on the top of the nose on both sides under the forehead, which are called orbits. 

Diagram of the Eye, The Parts of The Eye

The eyeballs live in these pits. There are six small muscles in each eye to keep them firmly fixed in their place. These muscles are flexible. With the help of these we can move the eyes here and there. 

From the front the eyes are protected by the eyelids. There are eyelashes on the side of the eyelids, which protect the eye in the open state. On the upper side of the eyelid, a smooth transparent and soft membrane is covered over the eye. It is called conjunctive. This membrane meets the skin at the edge of the eyelids. This is made clear by the picture. 

 

The Parts Of The Eye 

The Parts of The Eye

  • Eyeball :-  The human eyeball is made up of water, jelly and protein. It is capable of producing detailed 3D images. Eyeballs can focus themselves with the blink of an eye, changing vision from tiny particles to distant mountain tops. Eyeball i.e. the pupil is made up of these parts.
  • Sclera :- The sclera, often referred to as the white part of the eye, is the hard white tissue that is the major part of the eyeball. These are the muscles that are attached to the sclera and give movement to the eyes.  
  • Cornea :- The transparent covering of the eye that receives light is called the cornea. The cornea is like looking through a window and looking at something. 
  • Iris :- The iris is the part of the eye that contains colour. The iris is located beneath the cornea and serves to control the amount of light entering the eyeball.
  • Pupil :- Round and black holes placed inside the center of the iris are known as pupils. Light enters the eyeball through the pupil and enhances the vision. Because of this muscle, it can easily change its shape.
  • Lens :- Like the cornea, the lens is also a transparent tissue inside the eye. It is located behind the pupil and its function is to help the light to focus behind the eyeball.
  • Vitreous gel :- The jelly substance filled inside the eyeball that helps it hold its shape is known as the vitreous gel. 
  • Retina :- The retina is a tissue located on the back wall of the eyeball. It is made up of photosensitive cells and is known as rods and cones. Rods are responsible for seeing various shades of black, white and grey. And cones help to differentiate between different colors and see fine detail of subjects. 
  • Optic Nerve :- The optic nerve contains more than a million nerve fibers that transmit signals from rods and cones to the brain where they are converted into a film consisting of images that is broadly known as human vision. 

 

 

Diagram of the Eye 

Man uses his eyes as the most precious thing, as much as he is sensitive to his eye, it is probably not so much for any other organ because all the experiences related to seeing are done through the eyes. 

The Parts of The Eye

The structure of the human eye acts like a camera. The average diameter of the eyeball is 25 mm and the weight is about 7 grams. On the human face, there are two holes on the top of the nose on both sides under the forehead, which are called orbits. 

 

Some important facts of Human Eye 

  1. Talking about the size of the eye, it is 1 inch and its weight is about 8 grams.
  2. The shape of the eyes remains the same from birth, while the nose and ears are always growing. 
  3. When a newborn baby is born, at that time he is not able to identify colors. 
  4. The cornea of ​​the human eye resembles the cornea of ​​a shark fish. Because of which the cornea of ​​a human eye can be replaced with the cornea of ​​a shark fish during eye surgery.
  5. The human eyeball is usually about 17.5 mm at birth.  and 20-21 mm in adults. 
  6. There are a large number of rods in the human eye as compared to cones.

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