Fiddler crabs have a typical compound eye found in arthropods, sitting on the end of the eyestalk.
Illustration of the eyes from the dorsal view. Figure modified from Crane (1975).
Illustration of eyes from a side view. Figure modified from Crane (1975).
A close-up of the eyestalks and eye from the fiddler crab Uca vocans. The dark vertical band in the center of the eyes is known is the pseudopupil. Original photo by Chris Lukhaup.