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.
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.
Scientists have not thus far managed to build a device that will be able to replace the eye, regardless of how simple the process of seeing may seem when looked at first. The initial stages of seeing are, in fact simple, and consist of light detection, but the sophisticated interactions between the eye and the brain follow after, and researchers do not yet understand how these work.
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 human eye, in fact, is very limited, as it can only differentiate and perceive colors, depth and direction to a certain degree. Some animals have much greater sight, like some birds that can detect ultraviolet, or the mantis shrimp that has hyper-spectral vision. On the other hand, there are less evolved organisms whose eyesight is very basic. Some microorganisms' eyes only serve to differentiate between light and dark.
The human eye works along the same principle as the camera or any other light-focusing device. Light enters the iris and is focused towards a small patch of photosensitive cells at the back, which convert the photons to neural signals. The iris can contract or expand to limit or increase the amount of light entering the eye.
It is yet to be explained by the scientific community what kind of interaction occurs after the light has reached the photosensitive cells, and how this leads to a picture of the world being created in front of any individual. The mystery hiding behind the wonder of eyesight is one that remains to be uncovered in the years to come. Regardless of the lack of scientific explanation, the importance of eyesight is more than evident; this is why it is of vital importance to take very good care of eyes.
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.
Scientists have not thus far managed to build a device that will be able to replace the eye, regardless of how simple the process of seeing may seem when looked at first. The initial stages of seeing are, in fact simple, and consist of light detection, but the sophisticated interactions between the eye and the brain follow after, and researchers do not yet understand how these work.
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 human eye, in fact, is very limited, as it can only differentiate and perceive colors, depth and direction to a certain degree. Some animals have much greater sight, like some birds that can detect ultraviolet, or the mantis shrimp that has hyper-spectral vision. On the other hand, there are less evolved organisms whose eyesight is very basic. Some microorganisms' eyes only serve to differentiate between light and dark.
The human eye works along the same principle as the camera or any other light-focusing device. Light enters the iris and is focused towards a small patch of photosensitive cells at the back, which convert the photons to neural signals. The iris can contract or expand to limit or increase the amount of light entering the eye.
It is yet to be explained by the scientific community what kind of interaction occurs after the light has reached the photosensitive cells, and how this leads to a picture of the world being created in front of any individual. The mystery hiding behind the wonder of eyesight is one that remains to be uncovered in the years to come. Regardless of the lack of scientific explanation, the importance of eyesight is more than evident; this is why it is of vital importance to take very good care of eyes.
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