 IA, or irrigation aspiration, is the next step following the removal of the nucleus of the cataract. I always start with a subincisional cortex. I find this to be the trickiest part, so it's best to approach it first when the capsule or bag is full of cortex and it's top. Then I usually go counterclockwise, teasing the cortex out, starting peripherally and moving it centrally until all of the cortex is stripped away.