On the other hand, an eagle’s eyes are rotated towards the front of the head and are angled 30 degrees from the midline of the face. Unfortunately, our peripheral vision is quite poor. The use of both eyes gives us that ability to determine the depth of field and help us realize the speed of any moving object. We can only see complete images when we use both eyes, as closing one will block a portion of vision that was visible with that eye. Human eyes are positioned at the front of the heads, giving us a binocular vision and a peripheral vision of just 180 degrees. Mice’s and other small prey’s urine is visible to the eagles in the ultraviolent range, making them easy targets even a few hundred feet above the ground. Their ability to even see the UV light allows them to see the bodily traces left by their prey. They can even see ultraviolet light and pick out more shades of one color. The Range and Vividness of ColorsĮagles have the ability to see colors more vividly than humans can. The birds’ acuity is tested by changing the width of the stripes and determining from what distance the eagles begin to turn in the correct direction. One screen has a display of striped pattern to attract the eagle towards it and when they land on that screen, they are given a treat.
The birds are trained to fly down a long tunnel where two TV screens are kept at the end.
There is a scientific set-up to determine the strength of eagle’s vision. These give them a visual acuity of an impressive 20/5, or 20/4 which allows them to hunt even the tiny prey from hundreds of feet up in the air. Eagles, however, have retinas with cones and have a much deeper fovea-a cone-rich structure in the back of the eye. The normal or a ‘good’ vision for a human is 20/20. Visual acuity is the eye’s ability to separate details of an object without any blur. 6 Can We Get Eagle Eyes? What is Visual Acuity?