iridodonesis iridodonesis iridodonesis (/ˌaɪərɪdoʊdoʊˈniːsɪs/) is the vibration or agitated motion of the iris with eye movement. this may be caused by lens subluxation, the incomplete or partial dislocation of the lens; or by aphakia, the absence of a lens. the term originated from irido- (latin: iris) + doneo (greek: δονεο, to shake to and fro).