These are very handy for animals and serve like the goggles of a swimmer or flyer. The latest digital cameras have millions of pixels so that they can record detail almost as well as high-resolution film cameras. Predators like hawks and eagles have ten times as many retinal cells to observe a small object, perhaps a tasty morsel. Like people, their eyes are forward-looking and the vision fields of the two eyes overlap giving them good depth perception. The only penalty they suffer is a narrower field of view than people.
Birds have little if any magnifying power in their eyes.
Binoculars and telescopes may be handy at times, but if you miss something outside the magnified field, it could be fatal. Birds that are the objects of predators often have a wide field of view and their eyes are placed on the sides of their heads rather than the front. Ducks actually can see all the way around 360 degrees. While the forward-looking overlap of both of their eyes is small, they actually overlap a little in the rear as well. Like a lot of birds, ducks cock their heads sideways to look at you closely.