LIDRS is Lens-Iris Diaphragm Retropulsion Syndrome and it occurs where there is a reverse pupillary block and the pressure in the anterior chamber is higher than in the posterior chamber (note, posterior chamber, not posterior segment). This results in an overly deep anterior chamber until the iris margin is lifted or the anterior capsule edge is depressed so that the pressure gradient is equalized. During nucleus removal, LIDRS can make phaco more challenging so it should be resolved with the aforementioned techniques. We can, however, use LIDRS to our advantage during cortical clean-up since it will allow visibility of the entire capsule to ensure thorough removal of lens material. This video teaches the surgical pearl and shows the technique.