Our eyes are like a wonderful kind of camera, which takes pictures of the world around us. Then, sends the pictures to our brain, which works out what our eyes are seeing. Our vision allows us to learn 80% of everything and to be aware of our surroundings. It begins to work from the moment we open our eyes in the morning to when we close our eyes at night.
When we look at something, light from the object you’re looking at enters the eyes through the pupil, then is picked up by special cells on the back of your eye. The front of our eyes is made of he cornea, pupil, lens, and iris, which focuses image onto the retina. The retina is the sensory membrane that liens the inner surface of the back of your eyeball, which consists of millions of nerve cells that gather together behind the eye to form a large nerve called the optic nerve.
When light from the object you’re looking at enters the eye, it’s focused to a pinpoint on the macula, which is a small area in the centre of the retina at the back of the eye. The macula is responsible for what we see straight in front of us and gives us the vision needed for allowing us to read, recognize faces, and see fine detail and colour. When light stimulates the nerve cells in the retina, it sends messages along the optic nerve to the brain. Then, the optic nerves from your eyes join inside the brain and your brain uses the information from each optic nerve to combine the vision from your eyes allowing you to see one image.
Basically, light enters your eyes through your cornea and dilates your iris, which changes the size of your pupil depending on how much light your pupil needs to let in. Then, your lens sends the light to the back of your eye, which is the retina that consist of millions of nerve cells to form a large never called the optic nerve. Then, your retina sends the images as a signal to your brain and your brain uses the information to combine the vision from your eyes and allow you to see one image.
Parts of the Eye
Your eye is slightly asymmetrical globe, which is about an inch in diameter. The front part of your eye, which is what you see in the mirror, consists of:
The cornea is a clear dome over the iris.
The pupil is the black circular opening in the iris that lets light in, which is picked up by special cells on the back of your eye.
The iris is the coloured part of your eye.
The sclera is the white of your eye.
The conjunctiva is a thin layer of tissue that covers the entire front of your eye except for the cornea.
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