In anatomy, an eyestalk (sometimes spelled as eye stalk or known as an ommatophore) is a protrusion that extends the eye away from the body, giving the eye a better field of view than if it were unextended. It is common in nature and in fiction.
In nature, eyestalks are sometimes called tentacles, and may have olfactory organs and/or eyes at the end. Examples include snails, the trilobite superfamily Asaphoidea, and fly family Diopsidae. The crustacean family Polychelidae have eyestalks but no eye.
A beholder is a fictional character that sports numerous vertical eyestalks. Many Dalek variants have a horizontal eyestalk.
Tripods from Star Wars have eyestalks.