Losing one's eyesight is the same as losing a navigator through the world. This is because this front sight organs are of vital importance for all living organisms. There have been many evolutionary steps to ensure that living beings are able to see in the best possible way.
It is thought that eyes were an evolutionary characteristic of the primal animals that evolved during the Cambrian explosion. A few million years after, eyes are today the most unifying characteristic of all animals, which serves to prove their utility. However, this organ of the utmost importance is incredibly sensitive and it susceptible to many kinds of damage.
While evolution has led the human body to evolve different means of protection, these can be separated into three layers: the most outer layer is the skin eyelid that covers the eye and also waters it. The second layer is the membrane that surrounds the soft tissue of the eyeball. And the remaining layer is the cavity made of bone in which the eyeball resides. Such highly developed mechanisms are a clear indication that eyes should be well taken care of.
While the general functioning principle of the eye appears simple, human capacity has not gotten as far as creating a machine that can perform the role of the eye. The complexity of the eye lies in the fact that it is not merely a detector of light, but carries out all its functions by interacting with the brain in an intricate manner.
In favor of the claim that the eye is one of the most important sense organs in all organisms is the fact that there are more than 10 distinctive kinds of eyes present among various animal species. On top of that, it is believed that these evolved independently from each other. The fact that it is not just a few organisms that recognized the evolutionary importance of eyes, but ten different once, underlines the claim that eyes are of such great importance.
Human eyes can detect color, depth and direction to a reasonable degree, but there are birds that can see in UV. There are also microorganisms that have eyes that do nothing but distinguish light from dark. The mantis shrimp has hyper-spectral vision and probably possesses the most complex color vision system among all animals.
The functioning principle behind a camera, telescope, microscope or any other light-focusing device is the same as the one in the human eye. Once light enters the iris, it is focused in the direction of a small patch of photosensitive cells. The iris can be expanded or shrunk to increase or limit the amount of light that enters the eye. While the initial stage does not differ, what follows afterwards is radically different and undeniably more complicated.
The previously described phenomenon is just one part of eyesight. While that one is relatively simple, it is what follows that baffles scientists till this day and yet has no explanation. How is it that the eye communicates with the brain in order to create an image from light-focused photons? Even if there is still no clear answer to this, one thing is well known: a world without sight would be a world without light, and to preserve the gift of eyesight, one must take extensive care of their eyes.
It is thought that eyes were an evolutionary characteristic of the primal animals that evolved during the Cambrian explosion. A few million years after, eyes are today the most unifying characteristic of all animals, which serves to prove their utility. However, this organ of the utmost importance is incredibly sensitive and it susceptible to many kinds of damage.
While evolution has led the human body to evolve different means of protection, these can be separated into three layers: the most outer layer is the skin eyelid that covers the eye and also waters it. The second layer is the membrane that surrounds the soft tissue of the eyeball. And the remaining layer is the cavity made of bone in which the eyeball resides. Such highly developed mechanisms are a clear indication that eyes should be well taken care of.
While the general functioning principle of the eye appears simple, human capacity has not gotten as far as creating a machine that can perform the role of the eye. The complexity of the eye lies in the fact that it is not merely a detector of light, but carries out all its functions by interacting with the brain in an intricate manner.
In favor of the claim that the eye is one of the most important sense organs in all organisms is the fact that there are more than 10 distinctive kinds of eyes present among various animal species. On top of that, it is believed that these evolved independently from each other. The fact that it is not just a few organisms that recognized the evolutionary importance of eyes, but ten different once, underlines the claim that eyes are of such great importance.
Human eyes can detect color, depth and direction to a reasonable degree, but there are birds that can see in UV. There are also microorganisms that have eyes that do nothing but distinguish light from dark. The mantis shrimp has hyper-spectral vision and probably possesses the most complex color vision system among all animals.
The functioning principle behind a camera, telescope, microscope or any other light-focusing device is the same as the one in the human eye. Once light enters the iris, it is focused in the direction of a small patch of photosensitive cells. The iris can be expanded or shrunk to increase or limit the amount of light that enters the eye. While the initial stage does not differ, what follows afterwards is radically different and undeniably more complicated.
The previously described phenomenon is just one part of eyesight. While that one is relatively simple, it is what follows that baffles scientists till this day and yet has no explanation. How is it that the eye communicates with the brain in order to create an image from light-focused photons? Even if there is still no clear answer to this, one thing is well known: a world without sight would be a world without light, and to preserve the gift of eyesight, one must take extensive care of their eyes.
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