A method of conducting traditional two-handed phacoemulsification through two relatively small incisions by using a phacoemulsification tipsleeve with reduced diameter along with a second irrigation tip, with or without an attached manipulation tool. In one example embodiment, an optoelectronic module includes a housing comprising a top shell and a bottom shell, top and bottom printed circuit boards at least partially enclosed within the housing, and a spacer positioned between the first and second PCBs. The buffering electrodes are driven by amplifiers having signals detected by the flow responsive electrodes as an input. At least one of the electrodes has along a first cross section a concave profile and has along a second cross section a convex profile, the first cross section being parallel to the second cross section.