Eye problems and eye care
Chapter 1 Eye Formation The muscles for eye movements The eye is one of the most important organs for absorbing light sensations. Our head has two deep cavity-like structures in the skull bones just below the brain and at the front to protect the eyes. To protect the eyeballs, the eyelids are at the front and the skull bones around and at the back. The skull cavity contains the eyeballs and the muscles that move the eyeballs (see Chapter 2).
- Eye cavity in brain skull Eye eye 3 Nose eye: The structure of the eyeball is like a camera. The rays of light entering the eye, starting from the cornea at the very top of the eye, are refracted into the natural lens inside the eye and the fluid around it. Due to this refraction, the parallel rays of light are concentrated in one place on the retina so that a vivid (inverted and small, of course) image of the external view falls on the retina which is absorbed by the nerves in the retina and transmits the sensations of this image to the brain.
The brain converts the inverted and small image sensations that reach the brain into a straight image again, so that man can see. Obstruction at any point in this whole process can lead to a loss of vision or complete loss of vision.
The parallel rays of light are focused on the retina ...… Lens Retina Vein Brain People who work with photo and camera will experience that the most important thing for any image (photo) to be clear is true focusing. If the lens is focused on the right thing, that thing is very clear in the photo. But things in front and behind it look a bit blurry.
The same is true for the natural lens of the eye. If the rays of light are focused exactly on the retina through the natural lens of the eye, the view is very clear, but if for some reason the retina is slightly forward or backward, the image on the retina will become blurred. For those who have a number of glasses, the reason they do not look right without glasses is because of the dim reflection emanating from the front and back rays.
The main difference between the camera and the eye is the way the lens works. The focal length of the lens for focusing in the camera changes but does not change the roundness while the lens of the eye has the ability to change the roundness. This means that when the eye looking at a distant object is asked to read a print close to the eye, the roundness of the natural lens inside the eye increases so that the rays of light emanating from a nearby source fall exactly on the retina.
When the camera has to focus on a distant object after focusing on a distant object, the lens has to be moved closer to the object. The eyelids work to protect the eyelids from the external environment. It also keeps the eye clean with its glands. And through it the eye gets clear vision.
The eyelids do the important work of spreading to the entire surface of the eye and pushing the extra tears inwards. This eyelid works for the eye in the same way that a glass wiper does the job of cleaning the glass by spreading it all over the glass when it falls on the water on the car glass. Tear glands and tears: Each eye has a tear gland located in the skull cavity above and outside the eye.
Tears flowing from the lacrimal gland are a transparent fluid that works to keep the eye moist. It is necessary to constantly shed tears from the lacrimal glands to keep the eyelids wet and transparent. Tears also do the important job of delivering food to the cornea and protecting it from germs. In addition to the constant flow of tears in the eye, the production of tears increases dramatically when the eye is swollen, causing the eye waste to be washed away by the tears.
In addition to this, when certain emotions arise or unbearable pain occurs, more tears start to form from the lacrimal gland. Tears are also more common in many diseases. If this does not happen, the lack of tears will make the whole body pale and dry, blurred vision and increase the chances of infection.
Tubes connecting the eyes and the nose: A tube connecting the eyes and the nose is used to carry the tears that come to the eyes out of the eyes, the details of which are discussed in the chapter on nasals. The structure of the retina: When we understand in detail the structure of the retina, which does a wonderful job of absorbing the sensations of light, it makes sense to salute the wonders of nature. This is explained in more detail in Chapter VIII. 5
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