The ability rapidly to change the focus of its eyes enables an eagle to keep its prey or a carcass in sight during a long dive.
Tā kā ērgļa acis spēj ļoti ātri mainīt fokusa attālumu, ērglis, strauji laizdamies lejup, lieliski var paturēt acīs laupījumu vai maitu, kas guļ zemē.