"Keep your eagle eye out for danger.” We know what that means. And for good reason.

“Doth the eagle mount up at thy command, and make her nest on high? She dwelleth and abideth on the rock, upon the crag of the rock, and the strong place. From thence she seeketh the prey, and her eyes behold afar off. Her young ones also suck up blood: and where the slain are, there is she.” (Job 39:27-30)
When we call someone ‘old eagle eyes,’ we praise someone’s vision and perception. Indeed, in the above passage, God took credit for designing the eagle and its eyes are amazing! First, they are well protected. Besides the boney ridge above the eyes, the eagle has three eyelids! The first two are the ones we see. But for blinking, “they also have an inner eyelid called a nictitating membrane. Every three or four seconds, the nictitating membrane slides across the eye from front to back, wiping dirt and dust from the cornea. Because the membrane is translucent, the eagle can see even while (the membrane) is over the eye.”
Their eyes are about the size of a human eye but four times as sharp! Our eyes focus light on the fovea, the most sensitive area in the back of the eye (retina) where light is translated into electrical impulses and sent to the brain. An eagle has two fovea, which allow it to see both forward and to the side at the same time! “Bald eagles are capable of seeing fish in the water from several hundred feet above, while soaring, gliding, or in flapping flight. This is quite an extraordinary feat, since most fish are counter-shaded, meaning they are darker on top and thus harder to see from above.” The eagle will tuck its wings in and fall at over 100 miles per hour, then skim the surface, nabbing the fish with its talons, compensating for the deception of refraction!  “The eagle can probably identify a rabbit moving almost a mile away. That means that an eagle flying at an altitude of 1000 feet over open country could spot prey over an area of almost 3 square miles from a fixed position.” One reason the eagle’s eyes are so extraordinary is that they have an abundance of cones, those receptors that are sensitive to color. But this means they have little room for rods and thus the eagle has poorer vision than we have in reduced light.
God has much to say about eagles in His Word. In the passage above, God reminded Job that he had nothing to do with designing the eagle’s eyes. Neither did chance! We will look at other lessons from the eagle’s design in future articles.
http://www.baldeagleinfo.com/eagle/eagle2.html
more at: http://www.learner.org/jnorth/tm/eagle/VisionA.html#Eye%20Size