Without their eyes, most people would be completely lost, they are a means of navigating the world visually and are vitally important for all living organisms. Seeing is essentially, and the eyes have evolved some clever front sight formation methods in order to give humans the best picture of their world. Without this helpful organ, people would truly be in the dark ages.
Scientists believe that this organ has evolved over the last few million years, along with other animals, and first appeared with the first animals. One measure of the necessity of eyes is that this is the most common sense organ among all animals. Unsurprisingly, an organ as delicate as the eye is very vulnerable, its soft tissue easily damaged or hurt.
The human eye in particular is endowed with plenty of protection (eyelids, the eyeball lies within a protective shell made of bone, a membrane etc.) but people still manage to do damage to their eyes despite this. This is because, like any sensitive instrument, the eye needs extra care and protection in order for it to continue functioning optimally. That's why you need to take better care of your eyes if you want to continue enjoying the gift of sight.
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.
One of the most surprising things you would find if you were to do a survey of sight and sight organs among all the animals is the range of eyes that are out there. There are believed to be more than 10 distinct kinds of eyes existing in nature currently, some having evolved independently of each other. This goes back to the earlier point about the evolutionary utility of sight.
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.
Things are relatively simple before the light reaches the rods and cones (the light sensitive cells) but afterwards become appreciably more complex and as yet no convincing explanation of how people actually see has been put forward by the scientific community. The eye is a fascinating instrument and more still remains to be known about it. This is one reason why everyone must take every precaution to keep his or hers healthy, imagine losing such a wonderful gift!
Scientists believe that this organ has evolved over the last few million years, along with other animals, and first appeared with the first animals. One measure of the necessity of eyes is that this is the most common sense organ among all animals. Unsurprisingly, an organ as delicate as the eye is very vulnerable, its soft tissue easily damaged or hurt.
The human eye in particular is endowed with plenty of protection (eyelids, the eyeball lies within a protective shell made of bone, a membrane etc.) but people still manage to do damage to their eyes despite this. This is because, like any sensitive instrument, the eye needs extra care and protection in order for it to continue functioning optimally. That's why you need to take better care of your eyes if you want to continue enjoying the gift of sight.
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.
One of the most surprising things you would find if you were to do a survey of sight and sight organs among all the animals is the range of eyes that are out there. There are believed to be more than 10 distinct kinds of eyes existing in nature currently, some having evolved independently of each other. This goes back to the earlier point about the evolutionary utility of sight.
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.
Things are relatively simple before the light reaches the rods and cones (the light sensitive cells) but afterwards become appreciably more complex and as yet no convincing explanation of how people actually see has been put forward by the scientific community. The eye is a fascinating instrument and more still remains to be known about it. This is one reason why everyone must take every precaution to keep his or hers healthy, imagine losing such a wonderful gift!
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