Sunday, October 24, 2021, 00:11
In general, birds and above all birds of prey have developed the vision much more than those of the ear and the scent. So there is a popular saying: “You have an Eagle View”, for people with high visual acuity. Come at a distance small objects, although they do not arrive, such as the Eagles, to distinguish an ant for more than a hundred meters. The more the scientific knowledge about the vision of the Raptors progresses, the more amazing his visual organ seems, as well as the very complex processing that his brain performs with the signals it receives. With the help of the possibilities of laser techniques, some characteristics of the visual organ of the Raptors are implemented in the human eyes. For example, increase in some patients, visual acuity.
To study the vision of despise, scientists must design ingenious and special experiments. For example, it is not possible optometric measures based on letters or circles with a slot. The size for visual acuity is done by flying them by flying a tunnel to reach a pattern line. The deviation of the bird, depending on the width of the line, makes it possible to calculate the visual acuity. It has therefore been proven that birds of prey can see between four and seven times further than we are. This is because the visual organ has characteristics that distinguish it from people and that of other birds. Remember that you allow frontal eyes, if people, binocular vision. They are big eyes that are fixed relatively in jobs: that is why they have to see in every direction to turn their heads. But let’s see how other aspects exceed us.
The retina have many more light detection cells (cones) than humans. With camera language we would say that, up to the largest number of pixels, greater sensitivity. As for the fovea, we have one in the form of a small bowl and most Raptors two, in the form of a deep convex bowl. One, in central position, which they use for monocular vision and the other, in a temporary position, for binocular vision. The depth of the Foveas enables the eyes to act as a tele -losing, with an extra increase in their field of vision. In this way, to kill their heads to an objective, they can have something similar to a stereoscopic view and measuring distances, something very interesting to hunt. Moreover, prior birds, unlike other birds, come in color. His eye and brain discriminate much more than ours, they can capture much smaller wavelength differences than our visual system.
Moreover, they can see with the light of a part of the ultraviolette spectrum. Although it is unknown whether, associated with that light, there is a subjective feeling of color, it is known that there are signs, fundamentally for hunting, which only look. For example, reflexes in hair, feathers … however, with scarce light, birds of prey during the day, because of the low density of walking sticks in their retina, they lose more visual acuity than we are.
