Strabismus is the name of a group of disorders in which muscle tightening around the eye results in pulling of the eyeball to the side. Strabismus is also known as crossed eyes. Other symptoms include squinting, tilting of the head to look at things, frequent eye movements, headaches, rubbing of the eyes, tearing, and double vision.

Strabismus in adults is often diagnosed in those who were untreated or unsuccessfully treated during childhood. There are also some adults who develop strabismus due to illness or trauma, which usually result in double vision or a limitation in their depth perception or field of vision (peripheral and side).