• OPTICS INSIDE AND OUTSIDE

    To better understand how glasses work, you need to know how our eyes work. In shape, it looks like a round small apple. Its entire back and sides are covered with a dense protein shell. And, in front of this, the shell is replaced by a transparent - corneous shell, similar to a round watch glass.
      

    The Structure of the Human Eye
    The Structure of the Human Eye
    Under the protein-membrane, there is another one, covered with blood vessels - the choroid. In front, it is painted in blue, gray, brown or another color. This is the iris. It is present in both humans and animals. Only rabbit eyes are not colored in any way and always look red, because blood vessels are visible through their cornea.

    The iris surrounds a small hole — it's the pupil. Light penetrates through it. The pupil can expand or contract. And this is the resemblance of the eye to the camera. The camera’s diaphragm serves to let in the right amount of light into the camera.

    Behind the pupil settles a small convex lens. It is called the crystalline lens. The lens consists, of course, not of glass, but of a special dense transparent substance. But the purpose of the lens is the same as that of a glass lens, which collects rays of light at one point, focus. Then he directs them to the photosensitive plate, where the image is obtained. So is in the camera. But what about our eye? Is there a photosensitive record plate?

    Nearsighted Person Vision
    Nearsighted Person Vision
    Yes, there is, not just a plate, but a shell that lines the inside of the eye and is called the retina. On it, as on a photographic plate, images of everything we look at appear. It continuously "photographs" the world around us and transmits images along the nerves to the brain.

    The human eye is the most perfect apparatus. But sometimes the lens is too convex (in nearsighted people). Concave glass lenses can help a person with this vision. They put the focus in place. And in far-sighted people, the lens is too flat. Because of this, the focus goes into the distance. To bring it closer, you need glasses with convex lenses.

    So glass comes to the aid of the human eye.
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