The Human Eyes Definition in Biology: Diagram with Eye Parts
The Eyes Definition from Biological Perspective:
What do you know about the eye definition biology? Just learn about human eye facts and you will get precious information about it. You can define the eye as an organ of vision which makes you visualize the world around you. The eyes are two in number and each is placed inside specialized compartments in the skull.
The human eye is the organ which enables you to see. The human eye does not only let you view the scenes and phenomenon in your surroundings, but also enables you to differentiate between colors. Sometimes, there is a minor defect in the eye function and the individual cannot make difference between the red and green color. What is the name for such a condition? Well, you call it ‘color blindness’.
The Human Eye Parts with Diagram:
No doubt, the human eye diagram will add a lot to your knowledge. But, it cannot give you all the interesting information about its working mechanism and capabilities. When you talk of the human eye structure, they exist in pairs, each one being approximately 2.5 cm in diameter. There are following main parts of human eye:
- Sclera: The knowledge of eye parts and functions is both useful and interesting. The white part of our eyes is known as sclera. It consists of fibrous tissues. The job of this part it to protect the internal parts of the eye.
- Cornea: The transparent tissue through which light enters the eyes is called cornea. It exists in front of the eye. That is why, it looks prominent among different parts of the human eye.
- Iris: Iris is made up of muscles which contract or relax in order to adjust the amount of light which enters the eye.
- Pupil: There are many interesting facts about the pupil. It is, actually, an aperture controlled by the iris muscles. For instance, when it is dark, the iris muscles relax, causing the pupil to open up wider. Therefore, more light enters the eyes to enable us to see better. On the other hand, the pupil becomes narrow due to the contraction of the iris muscles. It occurs in the presence of excessive light in order to protect the cells of the eyes.
- Lens: The lens is present behind the pupil. Light enters the pupil, passes through the lens and is focused on the retina of the eye. The lens is capable of changing its shape in order to help us see near or far off objects. This is about how the human eye works.
- Retina: Digging further deeper into the human eye anatomy, you will come across the retina. The retina converts light into electrical signals which are transferred to the brain for processing. The retina contains two types of cells: rods and cones. These cells are sensitive to light. Rods are important for night-time vision when there is little light. On the other hand, cones play an important role in helping us see colors.
- Optic Nerve: The optic nerve takes electrical signals from the retina of the eye to the brain.
Eye Function
Human Eye Facts – How It Works
There is one of the human eye facts that these small organs perform a very complex function. The working mechanism of the eyes consists of the following simple steps.
Eye Problems
About the Author
