Hi one and all. Welcome to our blog!!! Don’t you guys think that it is so pretty and nice? I bet you all do. Anyway, we believed you guys will have an interesting and enriching time when visiting our blog. By visiting our blog, you all will be able to know more about one of our sense organs --- the eye. Over here, we will give you a brief introduction about our wonderful eye and also at the same time let you guys know some interesting facts and viewpoints.


Have you guys ever wondered how does our eye work? Why can we see things? Well, if you continue reading, you will be able to find out why. Eyes are organs that detect light. Different kinds of light-sensitive organs are found in a variety of animals. In the human eye, light enters the pupil and is focused on the retina by the lens. Light-sensitive nerve cells called rods (for brightness) and cones (for color) react to the light. They interact with each other and send messages to the brain that indicate brightness, color, and contour.

When you look at an object, light rays are reflected from the object to the cornea, which is where the miracle begins. The cornea is a transparent structure found in the very front of the eye that helps to focus incoming light.

Behind the cornea is a colored ring-shaped membrane called the iris. The iris has an adjustable circular opening called the pupil, which can expand or contract depending on the amount of light entering the eye. A clear fluid called the aqueous humor fills the space between the cornea and the iris.



Situated behind the pupil is a colorless, transparent structure called the lens. The lens' job is to make sure the rays come to a sharp focus on the retina. The resulting image on the retina is upside-down. Here at the retina, the light rays are converted to electrical impulses which are then transmitted through the optic nerve, to the brain, where the image is translated and perceived in an upright position!

Ciliary muscles surround the lens. The muscles hold the lens in place but they also play an important role in vision. When the muscles relax, they pull on and flatten the lens, allowing the eye to see objects that are far away. To see closer objects clearly, the ciliary muscle must contract in order to thicken the lens. This is called accommodation.

The interior chamber of the eyeball is filled with a jelly-like tissue called the vitreous humor. After passing through the lens, light must travel through this humor before striking the sensitive layer of cells called the retina. The retina is the innermost of three tissue layers that make up the eye. The outermost layer, called the sclera, is what gives most of the eyeball its white color. The cornea is also a part of outer layer.

The middle layer between the retina and sclera is called the choroid. The choroid contains blood vessels that supply the retina with nutrients and oxygen and removes its waste products. It is pigmented black so as to prevent internal reflection of light.

Embedded in the retina are millions of light sensitive cells, which come in two main varieties: rods and cones. Rods are good for monochrome vision in poor light, while cones are used for color and for the detection of fine detail. Cones are packed into a part of the retina directly behind the retina called the fovea. When light strikes either the rods or the cones of the retina, it's converted into an electric signal that is relayed to the brain via the optic nerve. The brain then translates the electrical signals into the images we see.

Wow, don’t you think that’s amazing? Read up on our various blog posts to know more about the eye! (: