Billy Baileys age 9 of Royal Oak, H. C
How do our eyes see?
Your bright eyes are a pair of little miracles. Ail day long, they give you a colored moving picture of the scenery. A camera can give flat pictures in two dimensions, showing up and down and sideways, Your eyes show three dimensions. They show the two dimensions in a flat picture, plus depth. They also keep themselves clean and sometimes can even mend and repair themselves,
Each eye is a round ball, about one and a quarter inches in diameter. vIhen you‑‑look in‑ the mirror, ‑you See only one side of the eyeball. The pest is buried and protested in the bones of the skull. The front of the eye, which you see in the mirror, is a bulge, In the center of this bulge is the little window which lets in the picture of the scenery. The picture falls on a screen in the back of the eyeball. This screen is connected to the brain by sensitive nerves.
Len s look at the front part of the eye. There is an eyelid which can be opened or closed to let in the light or keep it oat. The eyelid also acts like a windshield wiper. It cleans off any fine dust and keeps the surface of the eye. moist. The colored part of the eye is called the iris. It is a sensitive muscle around the small black hole in the cents:. This black role is celled the pupil. It is the window which lets in the picture of the scenery.
When the light is very strong, the iris squeezes tighter around the pupil. The pupil becomes smaller and less light enters the sensitive insyde of the eye. When the light is dim, the iris opens wide to make the pupil as big as possible. This way it catches every possible glimmer of lights
Just behind the pupil is a lens, somewhat like a small magnifying glees. It is fixed to a delicate muscle which can pull the lens out flat and thin or squeeze it short and thick, When you look at objects close by, the lens is short and thick. When you look at distant objects,, the lens is fiat and thin..' The lens brings the scenery info proper focus.
The picture of the, scenery comes through the pupil passes through the eyeball and falls onto screen called the retina. This screen is made from. About a million nerve cells. These wonderful little cells sort out the picture into, patches of color, light and darks the neat step is done.
The nerve cells of the retina flash their information to the brain.
The wonderful brain puts all the little. bits of information together to,
form a sensible picture. 'It 'can" then tell you. what your 'eyes are 'looking
at. Sight begins when light, with a picture of what you see, comes ...
through the pupil. The picture hits the retina: and `the ‑retina .,.sends this information to the brain. Each step is a living miracle, yet the whole operation takes place in the tiniest part of a second.