Hydrodissection is a technique to separate the lens nucleus from the cortex and the capsule by injecting fluid, under the anterior capsule leaflet
A fluid wave can be seen as the balance salt solution (BSS) passes between the nucleus and cortex
Following cortical-capsular separation during hydrodissection, the fluid may trapped posteriorly resulting in anterior displacement of the lens in the capsular bag
The nucleus can then be rotated within the capsular bag at the conclusion of these steps
In hydrodelineation the irrigation fluid is injected into the mass of the nucleus to achieve a separation of epinucleus from the harder inner nuclear material