It is questionable whether anyone with good eyesight can even imagine their life without it. A visual guide through the world, these front sight organs are one of the most important, if not the most important on the human body. The amazing formation mechanisms of the eye enable animals to perceive their surroundings in the way best suited for them.
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.
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.
The type of sight animals and organisms possess is suited to their evolutionary needs. While some microorganisms possess eyes powerful enough only to distinguish between light and dark, some birds are even capable of seeing UV. Humans, for instance, have a moderately good ability to detect depth, color and direction, while the mantis shrimp's hyper-spectral vision is believed to be the most intricate system of color vision there is.
The human eye can easily be compared to a telescope, camera, microscope or other devices that use light focusing. Light first enters the iris, and is immediately focused onto a small patch of light-sensitive cells at the back. The cells transform the photons into neural signals. In order the change the quantity of light entering the eye, the iris changes size.
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.
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.
The type of sight animals and organisms possess is suited to their evolutionary needs. While some microorganisms possess eyes powerful enough only to distinguish between light and dark, some birds are even capable of seeing UV. Humans, for instance, have a moderately good ability to detect depth, color and direction, while the mantis shrimp's hyper-spectral vision is believed to be the most intricate system of color vision there is.
The human eye can easily be compared to a telescope, camera, microscope or other devices that use light focusing. Light first enters the iris, and is immediately focused onto a small patch of light-sensitive cells at the back. The cells transform the photons into neural signals. In order the change the quantity of light entering the eye, the iris changes size.
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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