Visual Acuity: Eagles have exceptional visual acuity, estimated to be four to seven times better than humans. This allows them to spot small prey from distances up to two miles away.
Eye Size: An eagle's eyes are nearly the same size as human eyes but are much more efficient. Their large eyes allow more light to enter, providing brighter and clearer images.
Fovea Structure: Eagles have two foveae in each eye, compared to humans who have one. The fovea is the part of the retina responsible for sharp central vision.
Photoreceptor Density: The density of photoreceptors (cones and rods) in an eagle's retina is much higher than in humans. This high density allows eagles to detect even the slightest movements and see fine details at great distances.
Color Vision: Eagles can see a broader range of colors than humans, including ultraviolet light. This ability helps them detect the urine trails of prey animals, making hunting more efficient.
Rapid Focus Adjustment: Eagles can quickly adjust their focus, allowing them to switch from viewing objects at a distance to those up close with great speed. This is crucial for catching fast-moving prey during flight.