What does it mean when wildlife biologists say that “an eagle can see a rabbit in a field from miles away”? Does this imply that their vision is automatically more zoomed in? Do they have better than 20/20 vision, or is their vision simply clearer?

Question

What does it mean when wildlife biologists say that “an eagle can see a rabbit in a field from miles away”? Does this imply that their vision is automatically more zoomed in? Do they have better than 20/20 vision, or is their vision simply clearer?

In: Biology

Answer 1

Eagles have 20/5 vision
Humans have 20/20 vision.
So to see something 20 feet away, we need to be 20 feet away.
Eagles can see something from 20 feet away, that we need to be 5 feet away from to see.
This means that while you need to sit 50 cm away from your screen to see it clearly, an eagle can sit a bit over 2 meters away, and still read everything on the screen clearly.