A condition occurring in posterior annular synechia, in which an increase of fluid in the posterior chamber causes a forward bulging of the peripheral iris. ... (05 Mar 2000) ... 
Type: Term Definitions: 1. a condition occurring in posterior annular synechia, in which an increase of fluid in the posterior chamber causes a forward bulging of the peripheral iris.
Posterior synechiae that occur all the way around the pupil and aqueous cannot flow through.