Eyesoar is essentially a floating eye with wings. It also has four smaller versions circling itself. They may drop hearts when defeated, which is easily done since it takes a single swipe to accomplish. Eyesoar attacks by trying to hit Link with its body, much like most monsters in the Legend of Zelda series.
"Eyesoar" is a portmanteau of eye and soar, evoking its physical appearance, as it is a flying eyeball. Eyesoar is also phonetically identical to eyesore, which means something unpleasant to look at.