ELI5 Eagle Eye - do they have zoomed in vision?

When scientists say an eagle can see a rabbit in a field from a mile away, what do eagles actually see. Is their vision automatically more zoomed in? Do they have better than 20/20 vision? Why is 20/20 vision not perfect eye sight? Could I buy glasses that improve my vision beyond 20/20?   ... We explain like i'm five!   Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: deathstryk, cholula_brolula, viper826, risbia & subarusucks To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Join us on Twitter: https://www.twitter.com/eli5ThePodcast/ or send us an e-mail: [email protected]