The Human Eye

What do you really know about the human eye? I’ll explain it to you right now.

Today I am going to explain to all of you one of the most important human senses, which is the human eye.

The explanation of the human eye. The Normal Eye Sight is regarded by many people as the most precious of our senses and it provides more information about our environment than any of the other five senses. Sight allows us to see the shapes, colours, and sizes of objects around us in the world. Our eyes are responsible for this sense of sight and they are used for almost everything that we do: whether we are doing activities such as walking, sports, or whether we are reading, working on computers or watching television. Sight is formed by light rays that are reflected from objects and enter the eye where they are processed and sent to the brain for interpretation.

The eye measures approximately 2.5 cms in diameter and is found in front of the skull, in a well protected cavity called the eye socket.  The most important parts of the eye are as follows:

The Sclera

At the front of the eye is the sclera which is known as the “window of the eye”. The cornea allows light rays to enter the eye and is responsible for most of the focusing of the light rays.

The Iris

The iris is commonly referred to as “the colour of the eye”. In the centre of the iris is called the pupil of the eye. The iris controls the size of the pupil which acts as an aperture. When some iris muscles contract the pupil becomes larger, allowing more light into the eye. For example, when, if, we wake up in the middle in the night and switch on the light to go to the toilet, we normally get blinded by the lights. This is because our eyes, the iris has yet to adjust the size of the pupil as we are moving from a place of darkness to a place of bright light.  Another example is when you are jumping on the trampoline in the day time and when you get back into the house, everything seems dark inside the house.

The Lens

The lens lies directly behind the iris. It is a flexible, transparent structure and its shape is controlled by muscle fibers. Its role is to make the final focusing adjustments of light rays so they are sharply focused on the retina.

The Vitreous

The vitreous is the clear gel-like substance and it helps to maintain the shape to the eye.

The Retina

The retina found is in the innermost layer of the eye and consists of light-sensitive cells.

The Macula & the Optic Nerve Situated at the back pole of the eye, where the light sensitive cells are highly concentrated is called the macula.  Once the light rays have been processed by the retina, the electrical signals are carried by the optic nerve to the brain, which interprets them as visual images.

Therefore, the human eye is irreplaceable and is one of the most important senses out of the five human senses such as sight, hearing, touch, smell and taste.

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