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.
Eyes are believed by scientists to have evolved at about the same time as the first animals (during the Cambrian explosion) in one species and within a few million years had spread to most of the others. No other sense organ is more common among the animals, probably a measure of the eye's utility. With the eyes usefulness also comes it's vulnerability due to it being constructed of mostly soft tissue.
Eyes in all animals differ in the way they are protected. In humans, this protection is threefold: firstly, the eyelids protect and water the eye. Secondly, the soft eyeball is situated in a resistant shell made of bone. Thirdly, a membrane surrounds it to protect it from outside influences. It is only natural that the human body has evolved to preserve the eye as much as possible. Therefore, people should also take extra care of their eyes so as not to lose the wonderful possibilities of eyesight.
Explaining the basic working principle of the eye is simple, despite this, human beings are yet to create a device that even comes close to matching the eye's function. This is because the light is not simply a light detector, but does what it does through a complex interaction with the brain. In fact, it would take a powerful super computer to model the visual cortex on it's own.
An astounding fact about this amazing organ is that, amongst all animals, there is an incredible amount of types of eyes. In fact, there are 10 individual kinds of eyes, believed to have evolved separately from one another. In connection with the previously mentioned utility of sight, the fact that multiple organisms evolved eyes independently confirms the evolutionary importance of eyesight.
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 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.
Eyes are believed by scientists to have evolved at about the same time as the first animals (during the Cambrian explosion) in one species and within a few million years had spread to most of the others. No other sense organ is more common among the animals, probably a measure of the eye's utility. With the eyes usefulness also comes it's vulnerability due to it being constructed of mostly soft tissue.
Eyes in all animals differ in the way they are protected. In humans, this protection is threefold: firstly, the eyelids protect and water the eye. Secondly, the soft eyeball is situated in a resistant shell made of bone. Thirdly, a membrane surrounds it to protect it from outside influences. It is only natural that the human body has evolved to preserve the eye as much as possible. Therefore, people should also take extra care of their eyes so as not to lose the wonderful possibilities of eyesight.
Explaining the basic working principle of the eye is simple, despite this, human beings are yet to create a device that even comes close to matching the eye's function. This is because the light is not simply a light detector, but does what it does through a complex interaction with the brain. In fact, it would take a powerful super computer to model the visual cortex on it's own.
An astounding fact about this amazing organ is that, amongst all animals, there is an incredible amount of types of eyes. In fact, there are 10 individual kinds of eyes, believed to have evolved separately from one another. In connection with the previously mentioned utility of sight, the fact that multiple organisms evolved eyes independently confirms the evolutionary importance of eyesight.
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 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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