"He was slightly walleyed"
Portrait of George Whitefield, a strabismus sufferer
Public DomainPortrait of George Whitefield, a strabismus sufferer - Credit: Harvard University Portrait Collection
Portrait of woman with strabismus
Public DomainPortrait of woman with strabismus - Credit: Nikolay Mylnikov

Walleyed is a colloquial term used to describe a person suffering from strabismus, a condition which prevents the eyes from properly aligning with each other.

It is caused by a disorder of the brain in coordinating the eyes or of the muscles’ power or direction of motion.