Whereas a normal human's eyesight is 20/20, what is an eagle's eyesight?

It depends on the depth of field of their vision. The depth of field is automatically adjusted in relation to the proximity of objects in the environment they are flying through. But some predatory birds have use two focal points at the same time. If we had the eyesight of an eagle, we would not be in-control of selecting focal points and depth of field because it is processed automatically before going to the brain. It would degrade our use of vision. So their eyesight is far superior but not for us.

Not sure of the numbers, but check these facts:

They can spot a mouse on a beach up to 2 miles away.
They have binocular vision, in that they can see at least 8 times better than humans
they have polarized vision, meaning they can see down through the water up to about 20 feet to see when the salmon are coming up [they don't swim, so have to do a 'swoop & scoop' thing. Seeing from so high up, and down INTO the water allows them to catch the salmon as it's coming up to the surface.
Like owls, they have to move their whole head to turn around and see.
The reason for this is that their eyes take up so much room in their heads, not much left for additional muscles...
Their eyeballs are as big to their little skull as your fists would be to your face.
Each eyeball takes approx. 1/4 of their skull's space.

It is incredabley 20/2!
Love ya,
AnswerWoman532

An Eagle's sight is 140/140! It is seven times better!

Look the capacity you can compare the two is if you ask about the size! When it come to the sight the two are incomparable, its injustice to the human eyesight! Eagle's eyesight is outstanding, infact it is researched as being 6-7 times better than that of a huma, If an Eagle can see a fish from 1000 feet away and man struggle to see the very fish from few feet away, how do you compare that?

Sight is determined by the functioning of of the eye, and as compared to a human eye, eagle eyes has got extras that cannot be found on the human eye! Humans have a depression in their retina, called a fovea, it motivates maximum concentration on sensory cells and affords the greatest optical resolution. Unlike of a human, an eagle has a fovea with higher concentration of cells, and does not have just one fovea but two! One fovea affords optimum binocular vision to the front whereas the other fovea gives the best monocular vision at the side!

In conclusion its insult to an eagle sight to be compared to that of a human!