What is the difference between operations using stitching and the sutureless operations?

Basically, we are to extract the opaque lens and replace it with an artificial IOL with the help of Toric IOL surgery and Mutifocal IOL surgery. In order to extract the malfunctioning lens, older method was to give a long incision, extract lens through it, and then insert a rigid artificial lens. After all this operation, the incision was sealed tightly with the help of stitches. Now a very small incision. The opaque lens is broken into small pieces with the help of radiations and sucked out with vacuum. Then a foldable lens is inserted through the same small incision by folding it with help of a special type of injector. Since the incision is too small, no stitches are needed to close it. The incision is elf-sealing.